You need to first diagnose what is slow before you just throw more hardware at it
You might need to tune some code and your database, all depends on what is “slow”
For some insight, you could install my performance analyzer plugin and enable debugging,
to see if you have slow queries or a problem with variable scoping, or just certain pages running slowly
Or you can try fusion reactor.
Also what version of Lucee and java are you running?
I would suggest using a caching proxy for all your static content, such as Apache HTTPD and then use mod_event and mod proxy to serve lucee / ColdFusion.
Zac is right-- find what’s slow first before you do anything. I can push 5,000 requests a second through a Lucee hello world page on my old 4 core PC. FusionReactor will identity the slowest parts of your code or configuration right away.