I'm trying everything to speed up my site. W3 Total Cache, MaxCDN, Google Page Speed Service and Incapsula are services that I tried or that I'm still using.
When consulting performance measurement tools like GTmetrix or Pingdom.
My problem: Although I'm not changing content at all, scores vary. E.g. optimization of images or specification of image dimensions or "leverage browser caching" dimensions which Google Page Speed Service should deliver sometimes is active and sometimes it not.
Do you think that this is a matter of interference of some of those services?
Or are those performance measurement tools simply bad?
Which of the services mentioned would you activate and which would you use for handling what (e.g. minify, image optimization etc.)?
Looking forward to your reply!