#RC#
Understanding the basic mechanics of the mempool can help you avoid many common errors. When mist fails to process a request, it often indicates an out-of-sync local session error -32604. To handle the conflict related to -32604, ensure that only one web3 extension is active.
A common mistake is trying to send a new transaction during error -32604 while one is pending. To optimize mist performance, consider closing other tabs that have active web3 sessions. Always keep your recovery phrase offline and never share it while fixing errors like -32604.
The transaction might be failing because the market price moved past your slippage limit. Using a transaction simulation tool can prevent many costly mistakes and errors like -32604. Check the status of the sequencer to avoid -32604 when moving assets to a rollup.