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Thanks [USER=14040]@mxyzptlkfishstix[/USER] . I've also tested 3G connection now, that's with WebPageTest service. I haven't done any campaigns yet, but I think 90% (or something like that) of traffic comes from WiFi, according to [USER=12921]@cashmoneyaffiliate[/USER] ebook. However, I agree, I should test it also with slow connection. I suppose it depends where I plan to do campaigns, but in most countries in Europe (I'll probably target Europe with my first campaigns) LTE connection is a standard nowadays, it's often well over 12Mbps (12 is to test on WebPageTest). 3G is slow as hell (1.6Mbps), but again, I've tested my LP with 3G and here's results (3 runs per test and median speed taken):

3G (1.6Mbps), From: Dulles, VA - Chrome - 3G (North America)

No CDN, before html/image optimization: 5.013s

No CDN, after html/image optimization: 3.155s

CDN, before html/image optimization: 4.786s

CDN, after html/image optimization: 3.122s

So:

37% speed increase after html/image optimization on no-CDN server

35% speed increase after html/image optimization on CDN server

4.5% speed increase after switch to CDN, html/image not optimized

1% speed increase after switch to CDN, html/image optimized

Conclusion: Location is close to GoDaddy server, so not much difference after switch to CDN in North America. Huge performance improvement because of html/image optimization

3G (1.6Mbps), From: Prague, Czech Republic - Chrome - 3G (Europe)

No CDN, before html/image optimization: 6.443s

No CDN, after html/image optimization: 4.228s

CDN, before html/image optimization: 5.380s

CDN, after html/image optimization: 3.143s

So:

34% speed increase after html/image optimization on no-CDN server

41% speed increase after html/image optimization on CDN server

16% speed increase after switch to CDN, html/image not optimized

26% speed increase after switch to CDN, html/image optimized

Conclusion: html and image optimization is the main factor in performance improvement here. However, not every page can be optimized that much, so I stand by my thesis that half of success is in html and image optimization and another half in switch to CDN. However, I think the main factor will be always optimization. That's accoring to my test of course, your results may be slightly different, but similar I'd expect.

Why is that? The faster page load is, the better, isn't it?