When I am in Safari, typing an email or another form that has typing the resulting speed of text entry is mind numbingly slow!
I don't know what terms to search to identify the problem.
Why would it only be in an email?
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Without a list of sites that work and a list of sites that don't - here are some tips.
Over time you will begin to see if the slowness is CPU - which is things you can control on the computer or if it's not the CPU that's waiting. In that case, it's the web site or network.
The pragmatic solution is to type in a local word processor and then copy/paste into the slow web application if you find the web application interface slowing you down.