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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.82 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

10.24 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1.68 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

4.82 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

15.90 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
7 PASS 4 REVIEW 4 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4544ms total JS execution
FIX
4544ms total JS execution
Warning::
https://www.bu.edu/: 1215ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0Z1E...: 606ms CPU time
Warning::
Unattributable: 602ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZLH6...: 506ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WRN...: 454ms CPU time
Warning::
Third-party scripts: 4544ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 17% Style & Layout 14% Script Parsing & Compilation 11% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.bu.edu/1215ms393ms41ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0Z1EBE5RV7606ms484ms112ms3rd
Unattributable602ms22ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ZLH6JNFYKK&cx=c&gtm=4e64h1506ms428ms73ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WRNV877454ms361ms83ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HVBYYX9KF6&cx=c&gtm=4e64h1376ms287ms86ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js268ms219ms15ms3rd
https://www.bu.edu/home/css/style.min_1.css227ms0ms0ms3rd
https://www.bu.edu/home/js/modernizr.js167ms55ms4ms3rd
https://www.bu.edu/home/js/jquery.min.js124ms83ms23ms3rd
D
Page Weight Inventory
Action
64 resources · 2.0 MB · 285 KB savings available
FIX
64 resources · 2.0 MB · 285 KB savings available
Warning::
Page weight 1.0 MB over 1MB target
Got: 2.0 MB Expected: ≤ 1 MB
Info::
~285 KB of savings available
Warning::
63 third-party resources (100% of weight)
64 resources · 2.0 MiB · 63 third-party 1.0 MiB over 1MB target
JavaScript 37% · 764.3 KiB
Font 25% · 516.4 KiB
Image 22% · 459.5 KiB
CSS 9% · 177.7 KiB
Document 7% · 134.0 KiB
Other 0% · 1.8 KiB

~284.7 KiB of savings available

Remove unused JavaScript: 284.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
2.0 MB transferred, 64 requests
REVIEW
2.0 MB transferred, 64 requests
Info::
Page weighs 4.9 MB (2.0 MB transferred)
Warning::
JavaScript is 764 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 764 KB
Info::
Fonts are 516 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 516 KB
Info::
64 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
64 requests
0.42 g CO2 per page load
JavaScript 764.3 KiB 37%
Fonts 516.4 KiB 25%
Images 457.3 KiB 22%
CSS 177.7 KiB 9%
HTML 134.0 KiB 7%
Other 2.3 KiB 0%
Other 1.1 KiB 0%
Other 662 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Info::
All images are well-optimized
12 images 457 KB
0 oversized -0 KB
12 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
19 scripts, 285 KB unused
REVIEW
19 scripts, 285 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZLH6...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WRN...: 67 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HVBY...: 66 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0Z1E...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bu.edu/home/js/jquery.min.js: 20 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 285 KB
285 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-ZLH6JNFYKK&cx=c&gtm=4e64h1157 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WRNV877140 KB67 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HVBYYX9KF6&cx=c&gtm=4e64h1153 KB66 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0Z1EBE5RV7157 KB64 KB (41%)✓3rd
https://www.bu.edu/home/js/jquery.min.js31 KB20 KB (67%)✓3rd
https://www.bu.edu/home/js/micromodal.min.js3 KB—✓3rd
https://www.bu.edu/home/js/wp-embed.min.js1 KB—✓3rd
https://www.bu.edu/home/js/tooltip.min.js3 KB—✓3rd
https://www.bu.edu/home/js/jquery.waypoints-4.0.0.min.js3 KB—✓3rd
https://www.bu.edu/home/js/screenfull.min.js1 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
11 fonts (516 KB)
PASS
11 fonts (516 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

516 KB total

Render-blocking

0

of 11

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.8 s LCP 10.2 shttps://www.bu.edu/home/font/bu-default-icons.woffbu-default-icons.woff https://www.bu.edu/home/font/bu-default-icons.woff — 29.5 KiB — 59 ms — font-display: swaphttps://www.bu.edu/home/font/d4a4a960-2cf2-430e-8b13-cbf6f261ddb9-3.woffd4a4a960-2cf2-430e-8b13... https://www.bu.edu/home/font/d4a4a960-2cf2-430e-8b13-cbf6f261ddb9-3.woff — 36.9 KiB — 62 ms — font-display: swaphttps://www.bu.edu/home/font/019c3a13-b3d7-4c5a-be27-07a8334a43e6-3.woff019c3a13-b3d7-4c5a-be27... https://www.bu.edu/home/font/019c3a13-b3d7-4c5a-be27-07a8334a43e6-3.woff — 36.8 KiB — 71 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Medium-Italic.woffTiemposHeadline-Medium-... https://www.bu.edu/home/font/TiemposHeadline-Medium-Italic.woff — 49.7 KiB — 76 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Bold.woffTiemposHeadline-Bold.woff https://www.bu.edu/home/font/TiemposHeadline-Bold.woff — 47.9 KiB — 87 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Regular-Italic.woffTiemposHeadline-Regular... https://www.bu.edu/home/font/TiemposHeadline-Regular-Italic.woff — 51.0 KiB — 139 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Bold-Italic.woffTiemposHeadline-Bold-It... https://www.bu.edu/home/font/TiemposHeadline-Bold-Italic.woff — 49.7 KiB — 83 ms — font-display: swaphttps://www.bu.edu/home/font/8e221891-e89b-4eae-95ca-6346d9a41d20-3.woff8e221891-e89b-4eae-95ca... https://www.bu.edu/home/font/8e221891-e89b-4eae-95ca-6346d9a41d20-3.woff — 36.8 KiB — 95 ms — font-display: swaphttps://www.bu.edu/home/font/WhitneySSmAdvancedSemibold_normal_normal.woff2WhitneySSmAdvancedSemib... https://www.bu.edu/home/font/WhitneySSmAdvancedSemibold_normal_normal.woff2 — 65.3 KiB — 104 ms — font-display: swaphttps://www.bu.edu/home/font/WhitneySSmAdvancedBook_normal_normal.woff2WhitneySSmAdvancedBook_... https://www.bu.edu/home/font/WhitneySSmAdvancedBook_normal_normal.woff2 — 63.6 KiB — 106 ms — font-display: swaphttps://www.bu.edu/home/font/TiemposHeadline-Regular.woffTiemposHeadline-Regular... https://www.bu.edu/home/font/TiemposHeadline-Regular.woff — 49.2 KiB — 112 ms — font-display: swap
bu-default-icons.woff woff swap
Size 29 KB
Load time 59 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
d4a4a960-2cf2-430e-8b13... woff swap
Size 37 KB
Load time 62 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
019c3a13-b3d7-4c5a-be27... woff swap
Size 37 KB
Load time 71 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TiemposHeadline-Medium-... woff swap
Size 50 KB
Load time 76 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TiemposHeadline-Bold.woff woff swap
Size 48 KB
Load time 87 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TiemposHeadline-Regular... woff swap
Size 51 KB
Load time 139 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TiemposHeadline-Bold-It... woff swap
Size 50 KB
Load time 83 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
8e221891-e89b-4eae-95ca... woff swap
Size 37 KB
Load time 95 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
WhitneySSmAdvancedSemib... woff2 swap
Size 65 KB
Load time 104 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
WhitneySSmAdvancedBook_... woff2 swap
Size 64 KB
Load time 106 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
TiemposHeadline-Regular... woff swap
Size 49 KB
Load time 112 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~116 KB and ~232 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
64 requests over 2473ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.8 s LCP 10.2 shttps://bu.edu// https://bu.edu/ — 301 — 123 B — 594 ms — http/1.0https://www.bu.edu/www.bu.edu/ https://www.bu.edu/ — 200 — 134.0 KiB — 367 ms — http/1.1https://www.bu.edu/home/css/alert.csswww.bu.edu/home/css/alert.css https://www.bu.edu/home/css/alert.css — 200 — 1.5 KiB — 33 ms — http/1.1https://www.bu.edu/home/css/style.min.csswww.bu.edu/home/css/style.min.css https://www.bu.edu/home/css/style.min.css — 200 — 10.9 KiB — 36 ms — http/1.1https://www.bu.edu/home/css/block-frontend.csswww.bu.edu/home/css/block-frontend.... https://www.bu.edu/home/css/block-frontend.css — 200 — 616 B — 50 ms — http/1.1https://www.bu.edu/home/css/bu-slideshow.csswww.bu.edu/home/css/bu-slideshow.cs... https://www.bu.edu/home/css/bu-slideshow.css — 200 — 2.5 KiB — 52 ms — http/1.1https://www.bu.edu/home/css/bu-banners.min.csswww.bu.edu/home/css/bu-banners.min.... https://www.bu.edu/home/css/bu-banners.min.css — 200 — 2.2 KiB — 55 ms — http/1.1https://www.bu.edu/home/css/style.min_1.csswww.bu.edu/home/css/style.min_1.css https://www.bu.edu/home/css/style.min_1.css — 200 — 151.8 KiB — 107 ms — http/1.1https://www.bu.edu/home/css/fonts.csswww.bu.edu/home/css/fonts.css https://www.bu.edu/home/css/fonts.css — 200 — 934 B — 69 ms — http/1.1https://www.bu.edu/home/css/zotpress.shortcode.min.csswww.bu.edu/home/css/zotpress.shortc... https://www.bu.edu/home/css/zotpress.shortcode.min.css — 200 — 1.9 KiB — 74 ms — http/1.1https://www.bu.edu/home/js/jquery.min.jswww.bu.edu/home/js/jquery.min.js https://www.bu.edu/home/js/jquery.min.js — 200 — 30.9 KiB — 113 ms — http/1.1https://www.bu.edu/home/js/jquery-migrate.min.jswww.bu.edu/home/js/jquery-migrate.m... https://www.bu.edu/home/js/jquery-migrate.min.js — 200 — 4.7 KiB — 103 ms — http/1.1https://www.bu.edu/home/js/analytics-talk-content-tracking.jswww.bu.edu/home/js/analytics-talk-c... https://www.bu.edu/home/js/analytics-talk-content-tracking.js — 200 — 1.8 KiB — 129 ms — http/1.1https://www.bu.edu/home/js/modernizr.jswww.bu.edu/home/js/modernizr.js https://www.bu.edu/home/js/modernizr.js — 200 — 11.0 KiB — 114 ms — http/1.1https://www.bu.edu/home/css/custom.min.csswww.bu.edu/home/css/custom.min.css https://www.bu.edu/home/css/custom.min.css — 200 — 4.8 KiB — 93 ms — http/1.1https://cdn.fonts.net/t/1.css?apiType=css&projectid=b6ad2f95-8b9c-41ce-8e24-66c08ae7befbcdn.fonts.net/t/1.css?apiType=css&p... https://cdn.fonts.net/t/1.css?apiType=css&projectid=b6ad2f95-8b9c-41ce-8e24-66c08ae7befb — 200 — 637 B — 48 ms — h2https://www.bu.edu/home/img/icon-buhp-rhett.pngwww.bu.edu/home/img/icon-buhp-rhett... https://www.bu.edu/home/img/icon-buhp-rhett.png — 200 — 26.0 KiB — 25 ms — http/1.1https://www.bu.edu/home/img/icon-buhp-hub.svgwww.bu.edu/home/img/icon-buhp-hub.s... https://www.bu.edu/home/img/icon-buhp-hub.svg — 200 — 1.1 KiB — 26 ms — http/1.1https://www.bu.edu/home/img/icon-buhp-giving.svgwww.bu.edu/home/img/icon-buhp-givin... https://www.bu.edu/home/img/icon-buhp-giving.svg — 200 — 1.4 KiB — 23 ms — http/1.1https://www.bu.edu/home/js/bu-blocks-frontend.jswww.bu.edu/home/js/bu-blocks-fronte... https://www.bu.edu/home/js/bu-blocks-frontend.js — 200 — 11.1 KiB — 16 ms — http/1.1https://www.bu.edu/home/js/jquery.waypoints-4.0.0.min.jswww.bu.edu/home/js/jquery.waypoints... https://www.bu.edu/home/js/jquery.waypoints-4.0.0.min.js — 200 — 3.3 KiB — 19 ms — http/1.1https://www.bu.edu/home/js/popper.min.jswww.bu.edu/home/js/popper.min.js https://www.bu.edu/home/js/popper.min.js — 200 — 7.9 KiB — 24 ms — http/1.1https://www.bu.edu/home/js/tooltip.min.jswww.bu.edu/home/js/tooltip.min.js https://www.bu.edu/home/js/tooltip.min.js — 200 — 2.8 KiB — 29 ms — http/1.1https://www.bu.edu/home/js/micromodal.min.jswww.bu.edu/home/js/micromodal.min.j... https://www.bu.edu/home/js/micromodal.min.js — 200 — 3.4 KiB — 29 ms — http/1.1https://www.bu.edu/home/js/screenfull.min.jswww.bu.edu/home/js/screenfull.min.j... https://www.bu.edu/home/js/screenfull.min.js — 200 — 1.4 KiB — 191 ms — http/1.1https://www.bu.edu/home/js/bu-prepress-frontend.jswww.bu.edu/home/js/bu-prepress-fron... https://www.bu.edu/home/js/bu-prepress-frontend.js — 200 — 21.5 KiB — 33 ms — http/1.1https://www.bu.edu/home/js/script.jswww.bu.edu/home/js/script.js https://www.bu.edu/home/js/script.js — 200 — 6.2 KiB — 30 ms — http/1.1https://www.bu.edu/home/js/wp-embed.min.jswww.bu.edu/home/js/wp-embed.min.js https://www.bu.edu/home/js/wp-embed.min.js — 200 — 1.4 KiB — 54 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-0Z1EBE5RV7www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-0Z1EBE5RV7 — 200 — 157.4 KiB — 60 ms — h2https://www.bu.edu/wp-includes/js/wp-emoji-release.min.js?ver=5.8.10www.bu.edu/wp-includes/js/wp-emoji-... https://www.bu.edu/wp-includes/js/wp-emoji-release.min.js?ver=5.8.10 — 200 — 18.8 KiB — 190 ms — http/1.1
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https://bam.nr-data.net/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2011&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7&af=err,spa,xhr,stn,ins&ap=426&be=864&fe=1085&dc=716&at=TRpFQA0ZSxtAB0EDGEtF&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776800060072,%22n%22:0,%22f%22:598,%22dn%22:600,%22dne%22:607,%22c%22:607,%22s%22:608,%22ce%22:696,%22rq%22:696,%22rp%22:864,%22rpe%22:966,%22di%22:1564,%22ds%22:1565,%22de%22:1580,%22dc%22:1945,%22l%22:1946,%22le%22:1949%7D,%22navigation%22:%7B%7D%7D&fp=1168&fcp=1296 — 200 — 712 B — 211 ms — http/1.1https://bam.nr-data.net/events/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2242&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7bam.nr-data.net/events/1/b19c58809e... https://bam.nr-data.net/events/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2242&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7 — 200 — 412 B — 231 ms — http/1.1https://bam.nr-data.net/jserrors/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2246&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7bam.nr-data.net/jserrors/1/b19c5880... https://bam.nr-data.net/jserrors/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2246&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7 — 200 — 412 B — 100 ms — http/1.1https://bam.nr-data.net/events/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2249&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7bam.nr-data.net/events/1/b19c58809e... https://bam.nr-data.net/events/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2249&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7 — 200 — 412 B — 223 ms — http/1.1https://bam.nr-data.net/ins/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2251&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7&at=TRpFQA0ZSxtAB0EDGEtFbam.nr-data.net/ins/1/b19c58809e?a=... https://bam.nr-data.net/ins/1/b19c58809e?a=7212547&v=1.313.1&to=YV1SNkUDWEQDBRdQDFgXcQFDC1lZTQQWURMbUF8PUhJXUAc%3D&rst=2251&ck=0&s=3cf0752b2f021537&ref=https://www.bu.edu/&ptid=e545ba68628588a7&at=TRpFQA0ZSxtAB0EDGEtF — 204 — 390 B — 212 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 4544ms · 966KB · $60/mo
www.bu.edu
Other
Costly
Execution 1215ms
Transfer 134 KB
Monthly Cost $16/mo
Google Tag Manager
Tag Manager
Costly
Execution 606ms
Transfer 157 KB
Unused 41%
Monthly Cost $8/mo
Unattributable
Other
Costly
Execution 602ms
Transfer 0 KB
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 506ms
Transfer 157 KB
Unused 43%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 454ms
Transfer 140 KB
Unused 48%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 376ms
Transfer 153 KB
Unused 43%
Monthly Cost $5/mo
js-agent.newrelic.com
Other
Costly
Execution 268ms
Transfer 30 KB
Monthly Cost $4/mo
www.bu.edu
Other
Costly
Execution 227ms
Transfer 152 KB
Monthly Cost $3/mo
www.bu.edu
Other
Optional
Execution 167ms
Transfer 11 KB
Monthly Cost $2/mo
www.bu.edu
Other
Optional
Execution 124ms
Transfer 31 KB
Unused 67%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • www.bu.edu adds 1215ms and costs ~$16/month
  • Google Tag Manager adds 606ms and costs ~$8/month
  • Unattributable adds 602ms and costs ~$8/month
  • Google Tag Manager adds 506ms and costs ~$7/month
  • Google Tag Manager adds 454ms and costs ~$6/month
  • Google Tag Manager adds 376ms and costs ~$5/month
  • js-agent.newrelic.com adds 268ms and costs ~$4/month
  • www.bu.edu adds 227ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.bu.edu takes 1215ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 606ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 602ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 506ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 454ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 376ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

js-agent.newrelic.com takes 268ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.bu.edu takes 227ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

67% of www.bu.edu's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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