#**SEVERE** client-side JS slowdown on chatgpt.com in Chrome & Safari (with zero extensions!)

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Reported by @mint halo

Bug Report: **SEVERE** client-side JS slowdown on chatgpt.com in Chrome & Safari (with zero extensions!)
`Steps to Reproduce`

ONLY as of last evening (March 5):

  1. Open an Incognito session in latest Chrome OR Safari on latest macOS (Tahoe 26.3.1) *without ANY enabled extensions.
  2. Navigate to chatgpt.com and click on an existing ChatGPT conversation with >15-20 user turns (i.e. >30-40 total turns).
`Expected Result`

Normal chatgpt.com behaviour — normal conversation loading speed, normal scrolling speed, normal response streaming, etc. — like has been the case up until yesterday evening (March 5).

`Actual Result`
  1. Loading + rendering a convo takes 10-30 secs to populate (or even longer — scales linearly with # of turns).
  2. Just scrolling the conversation leads to severe lagging in rendering the viewport.
  3. Severe lag / full tab freezing during generation & response streaming. Web client either sits at the blinking dot without showing anything, or shows "Thinking..." but then quickly shows "Streaming interrupted. Waiting for the complete message...".
  4. NO ISSUES in macOS app, iOS app, or Android app.
`Environment`

macOS 26.3.1 on M1 MacBok Pro, Chrome 145.0.7632.160 (Official Build) (arm64), Safari 26.3.1 (21623.2.7.11.7)