Poor performance while generating Smart & 1:1 Previews

[Marta0D45]

After upgrading to Lightroom Classic 11, generating Smart Previes & 1:1 previews are ridiculous slow. LR uses only 2-4 cores becoming unresponsible! All other cores are not used. RAW files, catalog files, system and LR Catalog placed on SSD's. This performance is a joke 😞

Ryzen 5900X, 32GB DD4, X570 Aorus Master, 3*Corsair MP510 2TB, 2* Samsung 870EVO 4TB

[Marta0D45]

This happens only when Smart Previews & 1:1 previews are generating in the same time. Generating only Smart Previews or only 1:1 previews is ok, and all cores are perfectly used.

[GoldingD]

Might want to turn off that Auto Sync

Creating previews for 8005 files, going to hurt.

[Marta0D45]

Auto sync has no impact for creating previews. One task - generate Smart Previews utlilize 100% CPU power. Another one task - generate 1:1 previews also utilize 100% CPU. These two task running simultanously utlize only 20% CPU and take much longer time than normal.