Best WordPress setup? FastCGI, HHVM (PHP5 Backup), Pagespeed?

Thanks for your input.

Can you tell me the best testing commands? I haven't learnt any of these commands as of yet.

What's REDIS like setting up compared to FastCGI? Easy/Harder?

If I use FastCGI how do I handle Object Caching. Others say they use REDIS for Object Caching while using FastCGI for page caching. If I use REDIS for object caching does this mean I have to use W3TC plugin as well or can I setup REDIS via CLI? Sorry I have no idea about REDIS.

Also if you use Object Caching with any of method does it slow down the WP-Admin backend? I was running W3TC with APCu and it slowed down the backend dramatically.

Thanks