Harry Roberts @csswizardry.com · Feb 7 I have a client at the moment who has a FIVE MEGABYTE STYLESHEET which just took 6s to fetch over train wifi.
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This is misleading. It’s about 600KB over the wire; 5MB decompressed.
Because this stylesheet is defined before some JS, for that entire 6 seconds, their main thread was unable to do any work (other than some receive data events). Totally blocked by CSS. That goes some way toward explaining this: