I have noticed much higher memory usage with 1.26.2 as well. Something seems off. I’ve had a couple of commands crash cardano on my relay and producer node, running out of memory.
example command causing crash:
cardano-cli query ledger-state --mainnet | grep publicKey | grep <pool id>
I’ve set TraceMempool to false on the relay this morning to test. I should know more within a day about whether this helps.