Dario Alemanno

Hi this is my first time posting here, I have a 1999 2.5 Boxster and Its really tough to change gears and seems like it takes a while, this happens in all gears but is particularly bad in 2nd to 3rd. Apart from this the only other issue I have is the car seems to get really unstable above 90mph but it has pretty bad branded tyres(still lots of thread) on it from the previous owner so that could be the issue for that or track rod ends could have some play in then, anyone got any ideas? Thanks