This doesn’t seem to be a memory limit as your models open and load fast. It is important to pay close attention to data management and tree branches when working with transformations.
- Geometry and transformations have to be on correnspondig branches.
- Make sure you manage the data trees without flattening and simplifying.
- Send only relevant geometry to the transformation component and avoid Nulls or text.
Feel free to post a minimal version of the definition replicating this so we can have a closer look. You might also find following tutorials useful.