I’ve said it many times here on the forums, …
… but I’ll never suggest to upgrade any thing older than 4th generation machines to Windows 10. And, locally we made the choice to leave all our 4th generation machines at Windows 8.1.
I believe this is the root of your issues. Old machines that should not have ever been upgraded to Win 10, are experiencing multiple performance issues, especially with selection sets. (See the Technical Problems category.)
Agreed! p() is global method, and each time the interpreter encounters the p it has to take extra time to determine if you are wanting to call the method, or trying to access a local object reference named “p”.
Avoid using the names of global methods (from BasicObject, Object, Kernel, Comparable or Enumerable,) as local references.