Firefox recently update their browser and it is promising a significant upgrade in speed. This stems from better memory management so it will benefit both low and high end models.
While I have used Google Chrome for years, I thought I would try out the new Firefox this week and I was really impressed. Switching between multiple tabs was surprisingly quick, even with 10+ tabs open. General browsing was consistently quick, and I liked the new user interface. Small changes for the better were also made such as Google being the default search engine instead of Yahoo. Finally, bookmarks and passwords I had saved in Chrome transferred easily over to the new version of Firefox.
If you want to try out the latest version of Firefox it can be downloaded here: https://www.mozilla.org/en-US/firefox/