Cache pool information on reactions to avoid finding it each time #174
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Currently every single task that is added to the scheduler is required to lock a pool mutex to find it's pool. There are too many mutex locks on this path currently and it's obviously slowing down the system as a whole.
While lock free queues will hopefully eventually solve the lower level queue problems, this higher level mutex to select a pool can be avoided by caching it on the reaction as once a reaction is created it will always target the same pool.