Website speed and performance

Speed test on my website shows a load time of 1.63 s, which I am quite happy with actually! :slight_smile:
Anyhow the "Performance grade" shows c 75
Any problem with that!?

The test on Pingdom shows the following details on that c 75 status:
F 0 Combine external CSS
F 0 Parallelize downloads across hostnames
F 34 Remove query strings from static resources
C 79 Serve static content from a cookieless domain
I use:
A3 Lazy Load
W3 Total Cache Free version
Couldflare Free version
Appreciate any help on this matter :slight_smile:
Thank you very much in advance :slight_smile: