I strongly discourage installing all the skins. It is quite easy for them to overwhelm the resources of any computer system.
If you like losing a sure kill because your system suddenly pauses while it loads multiple skins at one time, then go ahead.
You certainly cannot preload all the skins as there is no version of Windows which will allow the game to use more than 2GB of RAM. With this next batch, we are now well over 3GB of memory needed to load them all.
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Then you have not run into multiple planes with different skins at the same time, for the first time. It would be impossible not to have a stutter, unless your frame rate is so low it masks the stutters, but then you would be looking at another set of problems.
It is impossible to access the hard drive for very long without causing a stutter. It is imposssible to have all the skins (over 625 now) preloaded without swapping occurring and each time that happens it would cause a pause in the game.
There is also a good chance your connection, to a busy arena, could timeout if you attempt to preload too many skins.
... For a wounded man shall say to his assailant ... "If I live, I will kill you. If I die, you are forgiven"... such is the rule of honor.