Apple has updated Logic Pro X to v10.3.3. Get it in the App Store.
New in Version 10.3.3:
- Optimizes performance for iMac Pro including support for up to 36 cores.
- Addresses an issue which can cause user-created content to become unavailable in High Sierra.
- Additional stability and performance improvements.
Read the full release notes at support.apple.com/en-gb/HT203718