Internet Optimizer: bizarre results
There's something wrong/bizarre with that tool.
It's showing always a fastest DNS server which is more than 100 % faster than the current DNS server. This seems not correct.
I changed manually my DNS Server settings on my system and I didn't use the Internet Optimizer tool for that because of the problems I had with it before (lost my IPv6 settings).
I changed to Cloudflare and next to Google Public DNS and meanwhile ran the Internet Optimzer tool. For each mentioned DNS Server the tool found another fastest DNS Server which was 101 % faster, especially "Level 3" with a response time of 24 msec instead of 138 (!) msec for the other servers.
OK, so I manually changed my DNS server settings to "Level 3", i.e. 4.2.2.3 and 4.2.2.4 as recommended by Internet Optimizer. Restarted my computer and ran the tool again. You know what? Found another fastest DNS Server 101 % faster : Which one? Yes! "Level 3" but now 299.244.0.3 and 4.2.2.1. Response time: 24 msec instead of 56 msec for the previous one Well well well, this does not seem serious anymore...
I will not run the tool anymore and I will set my DNS server settings manually again to Cloudflare.