Doing a full Black Mesa playthrough now. No commentary since many people are already doing the same.
https://www.youtube.com/playlist?list=PLnzvJvtkz3D3Gs1Zf4LzKSVWYQHJFHbRM&feature=view_all
Each video contains the full playthrough of one chapter. No part, split or anything like that. Loading time between transition is almost non-existent.
Enjoy! 
Hey, i do a Walkthrough of Black Mesa too!
And i want to get Tips, to make better videos!
It’s already 1080p with realy High Definition since Part 15 (Optimizing the Options till this Part) Loading Parts get cuttet of and i upload daily new videos!
https://www.youtube.com/user/TheRealNANEx
Hope you enjoy my Wakthrough and help me to make better videos!
PS: I do a Walkthrough of every Half-Life after the Black Mesa Project.
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.