Hi gonza045
Place the Subdivision Surface object above the clone, not above the Cloner. In this way, the clone is subdivided once; bit if it sits above the Cloner, the complete result will be generated newly with new a new multiplied mesh (way more calculations) while also causing the trouble you mentioned.
However, I would suggest not using the SDS and perhaps going with the RS Object Tag> Geometry.
Both options are here:
https://www.dropbox.com/s/sqrhjrgfeqgfjyu/CV3_2023_drs_22_RSss_01-11.zip?dl=0
If you have a question, please share a project file so I can see your exact setup; please share it reduced to the problem. Thank you.
All the best