This is the first bike i have ever owned so i dont know what it has on it.Is there anything i can do to make it quicker rather than faster through bolt-on parts, and also what can i eliminate to make it a few pounds lighter
If you want it to _feel_ quicker and more alive drop a tooth off the front sprocket and add a couple at the rear.
Full exhaust system, cams, flatslide carbs are all bolt-on items that increase peak output at the expense of civility at road speeds.
Your '98 600cc 100hp engine weighs 62kg - the same as modern 170+hp, 1000cc engines. The F4i engine weighs 59kg so it could be well worth swapping the engine in along with the complete fuel injection and electrics. The 600RR engine is marginally lighter still, revs faster and makes a bit more power, but is not the same engine design so would require more fabrication to swap. There are also F3's around with 900RR engines in them already.
To reduce weight and improve performance:
Lightweight full titanium race exhaust system.
Replace all the plastics with lightweight race fairings, smaller headlight and LED rear lights and indicators.
Remove the pillion seat and pegs and run a race tail unit.
Cut down/remove/replace the battery tray and rear guard.
Remove chain guard.
I think stock is 525(?) so switch to lightweight, race-quality 520 chain and sprockets.
Lightweight pegs and rearsets.
You can also cut off the entire steel subframe and fabricate an aluminium one for the rider only. This would probably make the frame illegal though (here you aren't allowed to cut or weld the main frame).
Remove the bar end weights.
Modern OEM forks, clamps and shock, revalve yours, or buy aftermarket suspension.
Modern calipers and master cylinders (no need for radial-mount though, conventional axial-mounts work just as well and are often lighter). Late GSXR600 conventional forks and brakes are a great addition to any older bike.
Modern floating front discs. Make an aluminium rear disc.
Replace the steel swingarm with a modern aluminium one.
Lighter modern OEM or aftermarket magnesium wheels. Don't bother with aftermarket aluminium wheels as they're often heavier than the OEM's.
Carbon fibre airbox.
Aluminium fuel tank.
Lightweight race battery.
If you're doing track work, removing the entire starting and charging systems make an enormous difference.