Check your air filter, plugs, synthetic oil, tire pressure, etc to make sure the bike is putting out what it can. Upgrading any of these to the best you can get is still cheap enough to try.
A 125 is not a crotch-rocket, but it can still out-run a car under some of the best conditions -- for a little while anyway.
Also, make sure that the rear sprocket hasn't been increased to something geared for off-road. You can get more top-end speed by making the rear sprocket smaller. This will decrease the "quickness" of the bike, but freeway speeds won't be rattling your teeth.
And ALWAYS, be safe. The first rule of biking -- defensive riding. You are invisible to a vast majority of cars, and the first mistake you can make is to become "confident" (notice I didn't say "overly confident?")
Cheers
Roger Moore

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