Did you download the latest version of E-signal. I was having the same High CPU usage until I updated to their newest version that just came out. It is not your computer or monitors
You didn't say whether it "spikes to 90% then declines back to normal", or "spikes to 90% and stays high". If it's the former, perfectly normal. If it's the latter, almost certainly caused by software.
Nevertheless, the problem is almost certainly software... could be the video driver, or just about anything else including something in Windows which has become corrupt. Do you still have the old monitors which you could reinstall? Did you change video cards? If so, is the driver you're using different for the different monitors?
Sounds right. Try loading your trading apps one at a time and checking CPU use before loading the 2nd and then do the same before loading the 3rd. Then you'll know which program is the problem.
OK thanks I will do that I'm not the best when it comes to computers so this is all trial and error. Thanks Phil