The KDE developers have included Strigi and Nepomuk to help users find files on their computer. You can read about strigi here or nepomuk here.
If you’re a power user, or someone that has a very organized desktop, then removing indexing, and desktop search will help increase your performance. This article is to quickly show you how you can lock in performance gains, and disable nepomuk & strigi
Here’s how you disable:
Go to systemsettings (Personal Settings or Configure Desktop)
Go to Desktop Search
Uncheck the boxes “Enable Nepomuk Semantic Desktop” and “Enable Strigi Desktop File Indexer”. (If you uncheck nepomuk it’ll stop strigi).