I’ve been using ST2/3/4 on Ubuntu for many years without any issues.
In the last day or so I’ve started to see significant lag (transient 200-400ms freezes) when moving the cursor around with the keyboard.
I thought it might be due to the Terminus plugin which i had installed recently – but the problem remained when I removed the plugin.
Eventually, the problem disappeared … and my current suspicion is that a recent build I did (dropping a large quantity of generated source code files into the working directory tree) would likely have caused the ST4 indexing process to start running - and that may well have been the thing causing the lag.
Glad it’s not happening now, but it was SUPER annoying for several hours, especially before I figured out why. I even went so far as to install and start using VSCode instead.