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Performance page slow to load on Linux #6708

@aam

Description

@aam

Dev tools peformance tab takes over 10 seconds to load, compared to just 2 seconds for observatory

launch-performance-tab-devtools.webm
observatory-timeline-launch.webm

This is on a simple dart app:

$ cat i1.dart
main() {
  Future.delayed(Duration(seconds :5), () { print('elapsed'); });

launched like

$ out/ReleaseX64/dart  --observe:8080 --disable-service-auth-codes --timeline_streams=all --timeline-recorder=endless --serve-observatory i1.dart

Devtools app launched separately, connected to this dart app paused.

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    P3issues we think are valid but not importantdevtools app performanceRelated to the performance of the DevTools app (not the Performance page)screen: performanceIssues with the Performance screen

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