Here are a few links for forum threads regarding your interface:
http://forum.cakewalk.com/Tascam-US144-mkII-and-Sonar-85Windows-7-64bit-m2001515.aspx http://forum.cakewalk.com/Tascam-US144-with-Sonar-Home-Studio-7-XL-NEED-HELP-m1915462.aspx http://forum.cakewalk.com/Tascam-US144-m1039329.aspx Please list the settings you have on your system for the following:
For your interface: Sample Rate, ASIO Buffer Size, exact driver version you are using
For Sonar: Sample Rate, Driver Mode, Record Bit-Deoth, reported latency values for - Input, Output, Total Round Trip, Sonar version (X2, X2a).
Are you using 64-bit Windows?
64-bit Sonar?
Is Windows up to current maintenance levels?
Is your interface plugged into a USB 2 port or a USB 3 port? (You likely will want/need to use a USB 2 port)
Is the USB 2 port powered?
Also, you indicate in your post that while your latency issue has been resolved, you have glitches during playback. Please explain further, as glitches sound to me like you are still having latency issues. So, what kind of glitches are you experiencing?
I looked up the specs for your CPU, and it would seem to me that this does not meet the listed minimum specs required for Sonar X1 or X2. Please note that there are folks running successfully with systems that are below the listed requirements, but I have also seen where folks just couldn't get things to run correctly without upgrading.
I would recommend you review and respond to my requests for information, and we look at tweaking those settings (and maybe some others), PRIOR to you shopping just yet for a replacement CPU upgrade.
Lastly, are you experiencing glitches for ALL projects, or just certain ones? Perhaps you are having latency issues caused by one or more effects loaded into problem projects. One way to check this is to load a project that gives you glitches, then hit the 'E' key on your computer keyboard to toggle off/on your effects, and see if your glitches go away.
If your glitches go away with your effects bypassed, then one or more of your loaded effects are causing these glitches, and you have to go through the exercise of figuring out which one or more are doing this. (hitting 'E' again will turn effects processing back on, by the way).
I will keep an eye out for a response post from you with the information I requested,
Bob Bone