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I'm posting for future reference... title says it all. This link will tell the rest (including the solution)... All at once I couldn't load most webpages. I happened right after installing the PSP file PSP_MasterQ2_2.0.3.dmg. Maybe coincidence, maybe not, but there's the solution in any case.
I didn’t follow it exactly, but in the folder (located in the main directory, not the user directory) I only deleted the settings file and the preferences file. Things are buzzing along nicely now...
I found this comment interesting: "Pity you have to reboot ," Huh?!?!
OK... enough applications including a few from Apple have memory leaks that rebooting is part of my daily routine.
Since upgrading to 32G RAM, I no longer run sudo purge in Terminal but on those occasions that I test, I can see the build up. If you run the command, you will release application memory but rebooting starts from scratch and the result is lower than clearing RAM in Terminal.
I don't run maintenance utilities anymore as 100% of them are useless but I do reboot.
BTW, I am not certain if DP or some of my plugs have a memory leak but if I leave it up for a few days, it will freeze my iMac. Since I now reboot daily, that's no longer an issue.
DP 11.34; 828mkII FW, micro lite, M4, MTP/AV USB Firmware 2.0.1 2023 Mac Studio M2 8TB, 192GB RAM, OS Sequoia 15.4, USB4 8TB externals, Neumann MT48, M-Audio AIR 192|14, Mackie ProFxv3, Zoom F3 & UAC 232 32bit float recorder & interface; 2012 MBPs (x2) Catalina, Mojave IK-NI-Izotope-PSP-Garritan-Antares, LogicPro X, Finale 27.4, Dorico 5, Notion 6, Overture 5, TwistedWave, DSP-Q 5, SmartScore64 NE Pro, Toast 20 Pro