Are you running out of RAM in any way?
The thing is: If there is unused RAM available, and the system can be sped up by using said RAM for caching, this is exactly what will happen. The moment the RAM is needed by another process, it is freed and made available.
The thing is: If there is unused RAM available, and the system can be sped up by using said RAM for caching, this is exactly what will happen. The moment the RAM is needed by another process, it is freed and made available.