I'm having issues in loading time before anything can be visualized in the view within my MFC C++ application. I've noticed a .DWG file (with significant number of text) will take over 40 seconds to show up in my own viewer (the same with ODA Viewer).

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  3. Vectorization and Visualization in Drawings

Currently we have option 'Use TTF font cache' which allow to speed up the vectorization process.

Talking about the rendering performance - some speed up can be reached if it is possible to put as much text as it possible to the one entity.

Also our OdTvGsDevice have option "EnableMultithread", which in your case will significanly speed up the vectorization process (it is different option in comparison with the similar option for the DWG to VSF import).