Why is the Custom Pricing product pricing groups sync taking longer than usual, and what can be done to resolve this issue?
The sync process can be impacted by the number of variants being updated and the discount method currently in use within Custom Pricing. If the slow sync is related to the specific version of Custom Pricing you're using, you may want to consider switching over to a different discount method.
For more details on each discount method and how to switch to a different discount method can be found here - https://support.boldcommerce.com/hc/en-us/articles/360044716171-Discount-Methods-and-How-to-Switch.