VERY Slow Site Load Speed

I’m moving this conversation from Comments to Support.

We purchased the theme about a year ago and have been happy with it. We have been experiencing a slow site load speed since the beginning (http://www.veztekusa.com). It appears we need to apply cashe, as well as minify HTML and JS. We are facing issues with the theme when we apply any cache plugin on website. It broke entire theme when apply Minify HTML and JS settings. We tried different cache and minify html plugin like W3Total and smush and each plugin broke the theme.
The website works OK, just slow, before applying Cache plugin’s Minify HTML settings.
Here are our Minify HTML settings: http://awesomescreenshot.com/04551m1i2c
After Minify HTML setting: http://www.veztekusa.com/beta/

In the comments section, you suggested CDN; we are a tech firm, are well familiar with CDN, and are aware that CDN is not the solution to this problem.
Would you please advise how to mitigate this situation.