[RUM-12600] Refine Continuous Benchmarking

[amortemousque]

Motivation

• Improve the performance test setup to produce predictable results:

  • Remove redundant tests that target the same pages or elements.
  • Replace fill with pressSequentially to mimic real typing behavior.
  • Reduce the number of hosts shown on the infra page so INP falls in the “needs improvement” range.

• Fix the ShopistLike test by removing the SDK initialization from the app itself. The perf test already injects the SDK init script.

• Address inflated TTFB by warming up the page: load it once before running the actual test.

Test instructions

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.

[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	164.05 KiB	164.05 KiB	0 B	0.00%	✅
Rum Profiler	4.84 KiB	4.84 KiB	0 B	0.00%	✅
Rum Recorder	19.50 KiB	19.50 KiB	0 B	0.00%	✅
Logs	55.91 KiB	55.91 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	121.33 KiB	121.33 KiB	0 B	0.00%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0039	0.0044	+12.82%
RUM - add action	0.0123	0.0144	+17.07%
RUM - add error	0.0111	0.0121	+9.01%
RUM - add timing	0.003	0.0031	+3.33%
RUM - start view	0.0037	0.0041	+10.81%
RUM - start/stop session replay recording	0.0007	0.0007	0.00%
Logs - log message	0.0132	0.0145	+9.85%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	26.06 KiB	25.25 KiB	-836 B
RUM - add action	100.52 KiB	111.30 KiB	+10.78 KiB
RUM - add timing	23.81 KiB	24.69 KiB	+905 B
RUM - add error	102.49 KiB	111.78 KiB	+9.29 KiB
RUM - start/stop session replay recording	23.33 KiB	23.53 KiB	+210 B
RUM - start view	442.18 KiB	481.81 KiB	+39.62 KiB
Logs - log message	44.68 KiB	44.13 KiB	-567 B

🔗 RealWorld

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 100.00%
• Total Coverage: 92.67% (-0.00%)

View detailed report

_{This comment will be updated automatically if new data arrives.
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[chatgpt-codex-connector]

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