Solidworks didn't support Windows 10 until SW2015 sp 5, so that might be a big part of your problem.
First, Set SolidWorks and all related .exe files to run in "Compatability Mode" to Windows 7.
As Glenn Schroeder said, SW 2014 was not intended to run in Windows 10,
You could get any number of problems if you do not run compatability mode.
You also did not list other key information:
Video Card - brand and model:
are you running with all the files on that computer or from a server.
What is running slow - loading (parts, assemblies, Drawings), Saving, rebuilding parts or assemblies, toolbox, simulation ...
Individual license or Network license
I have found Solidworks to slow down when Windows has an update ready to install. Get SW working in compatibility mode as Rick mentioned and ensure Windows updates are installed and you have at least restarted your PC. Good luck.