Your bike is about the same year and mileage as mine so it should go like hell.
Sailor is right that there could be several things that could be causing your problem and you have to work through all of them methodically and have some experience working with gasoline engines.
Having the bike run right boils down to 3 essential things: Fuel supply, sparks and air. Get all 3 together at the right time and the bike should be running fine.
If your clutch was slipping, then I think you should have noticed that in top gear as the tacho and motor revs would swing up very quickly and not stay put with constant road speed.
Forget electrical power. Even if the battery was poor, the alternator has plenty of power to run the bike.
I would start looking at fuel delivery. When was the in-tank fuel filter last changed? If you don't know the history of the bike, then get the tank off, replace the fuel filter and clean the tank, hoses and pump inlet strainer. The fuel rail pressure test which checks the pump is simple to do if you have quick disconnects fitted and made your own gauge like some of us. If you are a noob on engine mechanics perhaps get a shop to check the fuel pump pressure first.
Sparks sound O.K up to 60 mph unless the bike is only firing on 2 cylinders and you don't know that (?). This maybe why Sailor made the point about having somebody familiar with the bike also ride it. If the motor is firing 4 cylinders, check on the stand in neutral that it will rev to 6K+ briefly. If it won't and runs out of rpm suddenly, it is more likely a spark problem than a fuel problem - maybe even ECU or Hall sensor.
As others said, you need eyes on and need to start looking and checking yourself to give more information.
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