10ms vs 20ms is hardly noticeable. I still want to do some testing, but from what I've been told it doesn't make any difference.
These are my results, looking at the DotCom lookup the VM DNS servers are 3 to 4 times faster on average. May not make much difference but its the fastest as I have no issues, so I'll stick to them.
194.168. 4.100 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.007 | 0.009 | 0.020 | 0.003 | 100.0 |
- Uncached Name | 0.013 | 0.089 | 0.312 | 0.081 | 100.0 |
- DotCom Lookup | 0.017 | 0.024 | 0.038 | 0.005 | 100.0 |
----------------+-------+-------+-------+-------+-------+
cache1.service.virginmedia.net
Cable Online Ltd
194.168. 8.100 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.010 | 0.013 | 0.018 | 0.002 | 100.0 |
- Uncached Name | 0.015 | 0.091 | 0.350 | 0.086 | 100.0 |
- DotCom Lookup | 0.020 | 0.027 | 0.039 | 0.006 | 100.0 |
----------------+-------+-------+-------+-------+-------+
cache2.service.virginmedia.net
Luton Cable Online Ltd
8. 8. 4. 4 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.027 | 0.033 | 0.048 | 0.003 | 100.0 |
- Uncached Name | 0.038 | 0.137 | 0.326 | 0.085 | 100.0 |
- DotCom Lookup | 0.039 | 0.082 | 0.178 | 0.030 | 100.0 |
----------------+-------+-------+-------+-------+-------+
google-public-dns-b.google.com
Google Incorporated
8. 8. 8. 8 | Min | Avg | Max |Std.Dev|Reliab%|
----------------+-------+-------+-------+-------+-------+
- Cached Name | 0.030 | 0.036 | 0.052 | 0.006 | 100.0 |
- Uncached Name | 0.047 | 0.142 | 0.372 | 0.091 | 100.0 |
- DotCom Lookup | 0.043 | 0.079 | 0.165 | 0.029 | 100.0 |
----------------+-------+-------+-------+-------+-------+
google-public-dns-a.google.com
Google Incorporated