You should remove any and all (other than Apple built-in) virus scanners, speeder uppers, optimizers, cleaners, App deleters or VPN packages you installed yourself, or anything of that ilk. The idea that a third party, with no special knowledge of the inner workings of MacOS, can somehow find a simple way to protect your computer - that is not already being done by MacOS itself - suggests that the MacOS developers are somehow 'holding out on you'. The main reason is that they are relentless in scanning your files, non-stop, looking for things virus-like patterns in Everything. By far the easiest way to cause poor performance, instability, overheating and crashing is to install ANY third-party speeder-uppers, Cleaners, Optimizers, or Virus scanners.
