lesar, you need to be able to move around the map rather quickly, I, too, needed a couple of attempts to pass it and I consider myself a medium skilled runner. You need to master bunny hopping to a certain degree at least, and, if I remember correctly, you are allowed to also use the laser which means you need to use such techniques as wall lasering and laser jumping.
You only have to make ONE run in 26 secs to pass that map.
Bunny hopping means keeping the jump button pressed (if that doesn't make you hop constantly, turn on the respective option in the menu). If you are not familiar with bunny hopping and making sharp turns without loosing speed please watch the Xonotic Movement Tutorial that is available on youtube and on Xonotic's web site.
To use the laser for jumping just fire it at your feet and jump at the same time. If you shoot it at the right time and at the right angle, you can gain significant speed from that also horizontally (firing it at your feet while being already in the air and moving is best for that imho). Also when you are near to a wall you can fire it against the wall while moving either directly at the wall or slightly behind you, depending on your speed, and then quickly turn the mouse in movement direction again to continue your run. If you do it right, it is just a mouse flick to the wall direction, shoot laser, and flick back, all in less than half a second.
If you hang around #xonotic or #xonotic.pickup at around 19:00 GMT I might also show you the basics of how to move around in a training session, but I am not online reliably every day so you might give it a couple of days before we meet there :o) just if you happen to see me on IRC feel free to highlight me.
If you are interested, I could try to send you a demo how I ran that map, though I'd have to run it again first, but I should be able to do that.