Tim14121989:
I've only got Discord running, my spreadsheet (Excel), my ruler and Google Chrome. All of them take less than 2% CPU. Memory usage is below 20% as well... strange.
I bet the rule is the problem; I use VGG Caddy in the Flash version, but when I tried the PCEA version I had the same problem as you, when I closed the VGG Caddy the problem disappeared.
On the other hand there are no problems with having Excel open.
I would recommend that you try not to use your ruler.
I don't know what happens when Discord is open, but maybe you should try closing it too. GL