How fast is Cloud Native Synchronizer?

Self-hosted synchronizer is sequential, whereas the Cloud Native one synchronizes items using limited degree of parallelism.

This means the Cloud Native Synchronizer is significantly faster that the Self-hosted one. It can synchronize thousands of items per hour, while Self-hosted can perform hundreds of sync operations per hour.

Synchronization speed can vary based on a number of factors, see What are synchronization performance factors? 

The speed of Cloud Native can be as high as 8000 items synced per hour.