A performance concern in v6 reported in Discord says that /sellhead is taking roughly 130ms to execute (increasing the average execution time of the inventory click event). So far, there have been no indications that such a problem exists in v7 base tests (empty inventory, full inventory of stone and full inventory of heads) - all executions have taken 0.1-0.2ms to execute when testing with Stress. More realistic tests though need to be complete to confirm that the issue is resolved in v7.