How to fix delayed typing on certain websites?
Without a list of sites that work and a list of sites that don't - here are some tips.


Open Activity Monitor and look at CPU and choose View menu -> All Processes (and then sort by CPU use descending). Watch this for apps that are slowing things down.
Open text edit and type there. - make note of what process are using CPU when you type and how fast it responds.
Open your webmail (or a slow forum) and repeat.
If there are programs taking CPU when you see the slowness, quit them.
If you have quit everything but Safari, restart the Mac and repeat the fast/slow.


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.