Revert "optimization: txpool pending cache improvement (#177)" #242
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Description
The improvement of #177 saves about 50+ms of calling txpool.Pending() for the miner, when the pending transactions accumulate up to 100k+.
The improvement of performance depends on the number of pending list.
However, after we had resolved other bottlenecks, the pending transactions will usually be under 100k+, which means it can't save more than 50+ms, and besides, it changes a lot of code to get the improvement.
So we decided to revert it and make it a draft, to re-enable it in the future when needed.