www.mydomain.com vs www.mydomain.com/index.html

[dfavor]

Several problems are coming into play.

1) You're using CloudFlare, so all bets are off about what problem might be.

2) You appear to be using a Windows ASP backend site. If you're actually running ASP code, then you must use ASP. If you're just serving content, best to switch to LAMP.

If you read through many WPT post, first step of debugging is always remove CloudFlare as it tends to work poorly (only slow down fast sites) + introduces problem sets which are near impossible to debug.

So, remove CloudFlare + retest.

If you aren't actually running ASP code, switch to LAMP for easier tuning.