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)
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)