90,000m/s is the max speed of an ion drive - The type of drive used by Imperial and Rebel ships in Star Wars vs. 3,747,405.725m/s which is the speed of a reaction or station keeping thruster used in Star Trek, or aprox. 0.0125c. Thus even if the Federation just used their reaction thrusters for Sublight travel and manoeuvring, they would enjoy a massive speed advantage over the Rebels on a scale of 41:1, or 41x faster (well 41.6378, so I rounded down a little)
Star Trek ships use Impulse Drive for sublight. Full impulse is 0.25c and it is suggested combat speed is between 0.72c and 0.95c, even accepting .25c as a maximum. That is just over 800x faster then the maximum theoretical possible of an . It also allows them to turn on a dime and rotate fully around on the spot in less than 3 seconds. A feat no Star Wars capital ship can claim.
TIE stands for Twin Ion Engine and Rebel Fighters are shown to be comparable sub-light speed to the Empires'. Thus it is likely that Ion Drives are the main propulsion for Fighters. Fighters are faster than capital ships. Medium and Capital ships appear to use fusion drives for real space manoeuvrability and travel. This is actually slightly slower than . Thus we can infer Star Wars capital ships are slower than their fighters.
The targeting computers on the X-Wings and Y-Wings have been in the equivalent of Meters. When Luke goes in at " " they are decreasing at a thousand a second, giving a rough max speed of 5400 kilometres per hour (and this is very generous round up), which is less than escape velocity. (It also gives an indication of optimum, if not maximum, firing and targeting range for Lasers and Torpedoes in Star Wars)