Your results posted here are actually pretty good to look at, as they are done on the same time of day and across weekdays and weekends. Here is a list of the results you posted (times are GMT):
2012-09-05 9:10 AM Wednesday 70ms
2012-09-09 10:21 AM Sunday 76ms
2012-09-16 8:43 AM Sunday 75ms
2012-09-23 10:49 AM Sunday 93ms
2012-10-04 10:00 AM Thursday 111ms
2012-11-26 9:49 AM Monday 92ms
So looks like something happened after the 16th of September. This shows a 30-46% increase in your overall ping. This would be a concern for me personally. High pings have a negative effect on VPN and RDP connections. While 90-100ms isn't bad, it isn't particularly good. 70ms is probably borderline for local connections.
Here are the better results from the other providers (chosen as you have an antenna, so you should be getting the best possible connection):
Cell C: 46ms http://www.speedtest.net/result/2272360260.png
Vodacom: 48ms http://www.speedtest.net/result/2159979583.png
The MTN speed test thread is very old, so I have left it out
/Glipsie
Added:
Iburst: 80ms http://www.speedtest.net/result/2269830575.png
2012-09-05 9:10 AM Wednesday 70ms
2012-09-09 10:21 AM Sunday 76ms
2012-09-16 8:43 AM Sunday 75ms
2012-09-23 10:49 AM Sunday 93ms
2012-10-04 10:00 AM Thursday 111ms
2012-11-26 9:49 AM Monday 92ms
So looks like something happened after the 16th of September. This shows a 30-46% increase in your overall ping. This would be a concern for me personally. High pings have a negative effect on VPN and RDP connections. While 90-100ms isn't bad, it isn't particularly good. 70ms is probably borderline for local connections.
Here are the better results from the other providers (chosen as you have an antenna, so you should be getting the best possible connection):
Cell C: 46ms http://www.speedtest.net/result/2272360260.png
Vodacom: 48ms http://www.speedtest.net/result/2159979583.png
The MTN speed test thread is very old, so I have left it out
/Glipsie
Added:
Iburst: 80ms http://www.speedtest.net/result/2269830575.png