You just need to spend more time reading and your speed will increase naturally.

For example, I read a lot and it usually takes me no more than 2-3 hours to finish an average fiction book(about 0.5 mb in size) in my native language(I didn't received any training in speed reading)

I've switched from Google to Zoho services two years ago(I hate that "conversation view" in gmail)

Zoho Mail turned out to be an excellent webmail app. BTW, their other apps(Docs, Planner, Sheet) are definitely worth a try too.

http://www.zoho.com