If you have many products syncing at the same time on your Shopify store it could happen to face an error like this
Platform communication error: Exceeded 2 calls per second for api client. Reduce request rates to resume uninterrupted service.
This Shopify error is due to a limitation on API calls that Shopify apply to all standard shop and that you can read on their documentation here
Only Shopify Plus has an higher rate limit that permits you to make up to 4 requests per second.
If you have a Shopify Plus, ApiDrop will adapt his rate accordingly.