Make sure your machine meets the system requirements for SYNCHRO 4D Pro. Press F1 to view Help documentation and search for System Requirements for more details. 

Upgrade graphics driver and configure in NVIDIA control panel> Manage 3D settings. This will make sure SYNCHRO Pro runs on a high-performance NVIDIA processor, as sometimes there may be multiple graphics cards on the user's machine.

SYNCHRO 4D Pro offers the following options to optimize performance, most of which can be found in Options, 3D View> Advanced:

• Driver: choose DirectX 11
• Driver Option: Disable anti-aliasing, disable static model when playing animation/ focus time (but enable this option when viewing static model)
• Transparency: set to Fast Emulation for working/reviewing in SYNCHRO Pro. Can change to a higher quality setting (Depth Peeling) for exporting animation videos or images
• Detailed reduction: Enable Detail reduction and lower the frame rate
• Threshold Culling: Increase the cutoff size (in pixels) to skip rendering objects that are small at the current zoom level. Zooming in will draw those objects again.

Additionally, these options are available in v6.5.6 and newer versions:

• Smoother camera zooming with new area zooming algorithm - A new area zoom option in 3D View > Camera allows smoother, broader camera zooming with the mouse wheel. When enabled, zooming is slower but more flexible; when disabled, the camera zooms faster and focuses on a single point. This option is useful if the default camera zoom is not ideal.
• Improved 3D scene responsiveness by adding geometry conversion. This new Triangulate Shells option, when enabled, works around the issue where 3D View might seem slower during camera interactions. This leads to slightly enhanced 3D scene responsiveness and reduced delays during camera interactions.
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• Improved loading/unloading models on large projects with new option - When the option is enabled, all 3D objects are loaded into memory at project open and remain loaded; loading/unloading in the 3D Objects tree only controls visibility like 3D filters. It is best for workflows where frequent toggling, navigation, or interaction with many objects is expected throughout the session. But it also may result in slower project opening initially, higher memory usage, and a trade-off with not as fast or smooth overall performance.
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There are several best practices while building a 4D model in SYNCHRO 4D Pro:

Start with a clean model and proper 4D LOD. It may not be a good idea to keep all details, unless the purpose of the 4D model is to visualize a particular detailed installation process.

Load only the needed objects. When working on a part of the file (e.g. a single building or trade), select the objects you will be working on. Right click in the 3D window and choose Load/Unload> Unload Unselected. This will unload all the other objects from memory (and from the view). This is different than filtering. This doesn't reduce the file size, but it can help with memory usage.

To quickly load needed 3D objects, it is recommended that 3D filters be set up for this purpose. By location, by structure, by discipline, by level, area/ zone, etc.

Deleting unneeded objects, resources, and user fields can keep your file clean and reduce the file size.