I have installed Visual Studio 2015 Professional Edition, and my computer specs are Intel i7-3770 CPU 3.40 GHz, 8 GB RAM, and Windows 7 Enterprise 64-bit.
I wan
The Windows Defender Antimalware can cause Visual Studio to lag. As mentioned by Nostradamus in this answer:
Go to Update & Security -> Settings -> Windows Defender. Open the Defender and in the Settings selection, choose Exclusions and add the "devenv.exe' process.
Another thing I did was update ReSharper and every addon to the latest update.
I also noted that several processes called Microsoft Compatibility Telemetry, CompatTelRunner.exe was using a lot of CPU when I used Visual Studio. I disabled "Feedback and diagnostics" by following this guide.
It worked for me!