Thanks for the response!
Maybe I had to be more explicit on this topic. You’re absolute right about mod_deflate. I dived more into the details of this matter and found that the problem lies in minifying JavaScript. Apparently the inFocus theme of mysitemyway(.com) doesn’t allow .js to be minified. CSS is not a problem do.
I already addressed this issue to them. I sincerely hope it’s possible for the mysitemyway guys to allow W3 Total Cache to minify JavaScript in the near future since their themes are very flexible. Not only does it improve loading time but Google Page Speed and Yslow will give themes like infocus lower rates for this.