Not sure if you really have 100 kbps connection. It is more likely that
your ethernet connection to your DSL modem has up to 100 kbps capability.
This is a mistaken perception I have had in the past.
To test your internet connection bandwidth, there are many sites available for you to do it.....
Here
or
Or here
or
Or here for examples.
Try checking that first.
The lag probably doesn't have anything to do with your connection speed unless your bandwidth is extremely narrow and slow (unlikely). So this is a quick way to rule out whether it is your dsl line.