It's always a good idea to clear out the cache, or browser history, and clear cookies on a regular basis.
The drawback to this is that your saved usernames and passwords will be deleted and you'll need to re-enter them; But on the plus side, your privacy is more secure and your browser will work better.
Third party websites explaining how to clear your Cache:
Android mobile phones:
We do not control these third party websites or any of the content contained on those websites. Once you have left our website, we cannot be responsible for the protection and privacy of any data you provide. You should exercise caution and look at the privacy statement for the websites you visit. Always refer to the guidance documentation provided by your device manufacturer.