Completely eliminating subvocalizing is hard but you can reduce it to a very minimum. Doing exercises as those given Peter Kump's Breakthrough rapid reading really helped me. It doesn't involve listening to music or counting, but using your finger and go faster and faster.
Learn to speed read. Speed reading improves comprehension and reading speed.
Some of the claims are exaggerated, but I think most people can learn to read technical material around 600 WPM with a 85 to 90% comprehension rate. 90% comprehension might sound low, but I would wager that most people who don't speed read have a comprehension closer to 50 to 60%.
For less dense material you might be able to speed read around 1000 WPM.
I worked my way up to it, and I do not normally read at that speed. The same book (I think it was Break Through Rapid Reading by Peter Kump) recommended forcing yourself to practice reading at far higher than your normal rate (e.g. double), even if you do not fully comprehend everything you read. This will train your brain to read faster over time.
I like this one and a lot of people recommend it. https://www.amazon.com/dp/073520019X/ref=cm_sw_r_cp_apa_glt_fabc_XBSBXSAPS6CXXTSSAQVF?_encoding=UTF8&psc=1
I think yall inspired me to start working in it again.
I used Peter Kump's book to learn
It just works.
I practiced using this book for the ACT, and it helped bring my score up from a 26 to a 33. Perhaps you should try it if you reading speed is lacking: https://www.amazon.com/Breakthrough-Rapid-Reading-Peter-Kump/dp/073520019X
1.) This, by the end of three weeks my reading speed increased by about 100 wpm. The cliff notes is to basically use your index finger or pen to mark where you are on the page (that increased my wpm by about 50 wpm)** the rest was just practice/patience.**
2.) This one helped me to read more efficiently.