VD have issued a statement on Discord:
"**__Quest v74 PTC (Public Test Channel) has performance issues with Virtual Desktop, stay off the PTC__**
@everyone Sorry for the ping, but we’ve had lots of reports of performance issues on the Quest v74 PTC, so make sure to opt out in the Meta Horizon phone app. If you are already on v74, opt out and then perform a factory reset to go back to v72. See below for instructions:"
https://discord.com/channels/564087419918483486/592909523295928340/1333466101119455333