Whatever you do don't even put it near the track, do what I do with stuff like the Aston Martin DBR9, buy one to race and another to keep mint. The mint one being the signed one obviously

I don't have the RML Lola, but I have the factory MG-Lola and the Knighthawk MG-Lola which is the same chassis and shell as the RML car, and your right it goes like **** of a stick. The fastest Scalextric car I have found recently (straight out the box) is the cheap Audi TT and porsche boxsters they sell. I think they are designed for kids because you can chuck them at all but the sharp 90 degrees corners without them coming loose. No fun that though.
Fly or Slot-it cars are really quick but again they are normally too pretty to chuck round the track.
Scalextric are bringing out later in the year the Audi factory R10 and the Porsche DHL Penske spyder. I'll be adding them to my collection certainly.