It's not as fast as Focus, but if you want an alternative to Chrome Firefox for Android should work better with Google Apps that are (probably) broken due to Focus's anti-tracking features. It is based on the same rendering engine as desktop and should benefit from many of the future speed improvements of Firefox 57.

On Android Chrome is arguably better if you want Google account integration or raw speed, but Firefox for Android has a more traditional UI, extensions, and is fast enough for most of my browsing.