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::
i
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
TransferFOIT (block)FOUT (swap)
bu-default-icons.woffwoffswap
Size29 KB
Load time59 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
d4a4a960-2cf2-430e-8b13...woffswap
Size37 KB
Load time62 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
019c3a13-b3d7-4c5a-be27...woffswap
Size37 KB
Load time71 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
TiemposHeadline-Medium-...woffswap
Size50 KB
Load time76 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
TiemposHeadline-Bold.woffwoffswap
Size48 KB
Load time87 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
TiemposHeadline-Regular...woffswap
Size51 KB
Load time139 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
TiemposHeadline-Bold-It...woffswap
Size50 KB
Load time83 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
8e221891-e89b-4eae-95ca...woffswap
Size37 KB
Load time95 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
WhitneySSmAdvancedSemib...woff2swap
Size65 KB
Load time104 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
WhitneySSmAdvancedBook_...woff2swap
Size64 KB
Load time106 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
TiemposHeadline-Regular...woffswap
Size49 KB
Load time112 ms
Start1.3 s
RiskFOUT — 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
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-party4544ms · 966KB · $60/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.bu.edu
www.bu.edu
Other
1215ms
134 KB
—
$16/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
606ms
157 KB
41%
$8/mo
Costly
Unattributable
Unattributable
Other
602ms
0 KB
—
$8/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
506ms
157 KB
43%
$7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
454ms
140 KB
48%
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
376ms
153 KB
43%
$5/mo
Costly
js-agent.newrelic.com
js-agent.newrelic.com
Other
268ms
30 KB
—
$4/mo
Costly
www.bu.edu
www.bu.edu
Other
227ms
152 KB
—
$3/mo
Costly
www.bu.edu
www.bu.edu
Other
167ms
11 KB
—
$2/mo
Optional
www.bu.edu
www.bu.edu
Other
124ms
31 KB
67%
$2/mo
Optional
www.bu.edu
Other
Costly
Execution1215ms
Transfer134 KB
Monthly Cost$16/mo
Google Tag Manager
Tag Manager
Costly
Execution606ms
Transfer157 KB
Unused41%
Monthly Cost$8/mo
Unattributable
Other
Costly
Execution602ms
Transfer0 KB
Monthly Cost$8/mo
Google Tag Manager
Tag Manager
Costly
Execution506ms
Transfer157 KB
Unused43%
Monthly Cost$7/mo
Google Tag Manager
Tag Manager
Costly
Execution454ms
Transfer140 KB
Unused48%
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution376ms
Transfer153 KB
Unused43%
Monthly Cost$5/mo
js-agent.newrelic.com
Other
Costly
Execution268ms
Transfer30 KB
Monthly Cost$4/mo
www.bu.edu
Other
Costly
Execution227ms
Transfer152 KB
Monthly Cost$3/mo
www.bu.edu
Other
Optional
Execution167ms
Transfer11 KB
Monthly Cost$2/mo
www.bu.edu
Other
Optional
Execution124ms
Transfer31 KB
Unused67%
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.