Add release note about conversation loading perf

5 jobs for mjog/558-webkit-shared-process in 18 minutes and 5 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #512436
fedora

00:08:01

passed #512437
ubuntu

00:03:30

 
  Test
passed #512438
flatpak

00:08:59

 
  Deploy
passed #512439
review

00:00:28

passed #512440
allowed to fail manual
stop_review

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