Windows Search is used to index every file and folder in your computer in order to increase the speed with which the search results appear. Although it accomplishes just that, it also consumes significant amount of system resources, mainly due to the fact that it increases the CPU load. You can speed up your system by disabling Windows Search.
Go to your hard drive(s) through Windows Explorer. Right click on any drive you want indexing disabled and select Properties. On the General tab uncheck “Allow files on this drive to have contents indexed in addition to file properties”. Next, given the fact that you want Indexing disabled all together and not just on specific drives, you can also disable the Windows Search service. Press Win + R and on Run type “services.msc“. The list of Windows services will appear and the service you ‘re interested in is called “Windows Search“. Right click on it and select Properties. On the Startup Type select Disabled and on the Service Status press Stop.