I wanted to do a check from fellow users to see what of these hardware improvements you've made after the release of X2a which produced for you the greatest performance increase for Sonar. This includes the ability to increase tracks and/or experience general responsiveness as well as the ability to reduce latency or minimize drop-outs.
1) Additional CPU Cores
2) Faster Motherboard
3) More/Faster RAM
4) SSD drive
5) Separate working disk/H.D.
6) Faster Video Card
Additionally, even though this was not part of my question, but useful: Using vs. not using Anti-Virus software, de-fragmenting your hard drives, etc.