My MacBook started having what seemed to be intermittent performance issues. After lots of troubleshooting I figured out that it was because I had two external monitors hooked up to it. Unplugging one of them solved the problem. I’m going to try hooking them both up through the Thunderbolt ports instead of one through Thunderbolt and one through HDMI.
I’ll try to speak English from now on. Stay healthy and safe.