Recently I started noticing that my Visual Studio started lagging like crazy when I tried to open Intellisense popup. The IDE was literally unresponsive for 10-15 seconds. It was annoying. Period.
I was trying to disable numerous extensions and add-ons, but the intellisense was not collaborating. Then, I tried to create basic sample solution with one project and Intellisense was working okay. So, the only difference between the bare-bone sample solution and the typical solution I work with, is the number of files. And I have to tell you, that with all the latest and greates advancements of web technology, typical web solution can contain thousands of files, which VS tries to analyze and fit into small intellisense popup at every key stroke you do.
Since I do not need Resharper's support outside C#-world, it might be a good idea to limit scope of ReSharper Intellisense to this specific language only, so that there is no unnecessary activity performed.