Hi bippukt,
Sorry, but I'm afraid that there is no command line which enables you to do this. My sincere apologies.
Rebooting your PC does not seem to increase your R:TW performance, but re-starting R:TW after a few hours most certainly optimizes performance! R:TW features a huge and nasty memory leak bug which is a complete PC hogger on lower tech PCs after a certain length of time. Re-starting R:TW removes it's horrible effects and prevents it from dominating your system resources, causing the game to CTD.
If you desire more information on other ways to boost R:TW (and other game) performance, then this very useful guide could help you. Good luck, cheers!
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