See heres the thing with u guys that say storm takes some time to conjure up something.
We see the weather in real life everyday. We see how slowly clouds move across the sky and how a drop or two of rain might fall before it begins to pour so we see that the weather is slow but powerful at times. Storm can CONTROL the weather which that right there proves she can manipulate the speed that weather reacts.
How fast does a lightning bolt hit? Faster than Jean can form a thought. You have never seen telekinesis or telepathy in real life so in your head it is a magical power that is super fast and maybe its also pink in color...
Any mutant in the marvel universe has a small time effect in their use because they are all affecting something and it doesnt just happen like magic. Thor needs to think about the thunder before it happens much like Storm needs to form the particles and charges which can be done in no time. Storm would have to raise her hand much like Thor needs to aim his hammer. Jean doesnt just look at an object and it lifts by itself. Jean needs to find the object and hold it with her mind, then use her mind force to move it. This can take a while depending on the object or it can happen in a split second.
Jeans telepathic abilities also require her to reach in to others minds and do stuff to them which in that time Storm can fry her with a powerful bolt.
These two characters are both strong and they each have their strengths and weaknesses to deal with if they ever fought each other. It can go in many ways, who strikes first? who does what with their powers? and so on... I just hope since im a Storm fan that in whatever fight ends up happening...Storm wins