Hello,
After typing two characters, I have to wait 3-5 seconds before I can type again. I didn’t notice this before the latest update. Is there something I can do? I’ve already reinstalled Writer. Thanks much!
So, help us to help you: OS name, LO versions (old and new).
Memory size of your computer?
Processor specification?
How you reinstalled the LO? Was it a clean installation? (After full uninstall the previous version, and after deleting the rest parts of the old version?)
…and…I got pissed and came back and it’s working. I don’t know what I did. It had been doing as described earlier for 2 days. idk, but thanks. 
I’m unsure what the old version was.
Version: 24.2.4.2 (X86_64) / LibreOffice Community
Build ID: 51a6219feb6075d9a4c46691dcfe0cd9c4fff3c2
CPU threads: 4; OS: Windows 10.0 Build 19045; UI render: Skia/Vulkan; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL threaded
My first thought was that something was running in the background causing it to lag, perhaps a system process like a virus scan or similar. If it happens again, check Task Manager to see if something is using up the CPU or disk whilst it is happening.