The portable version is struggling with GPU acceleration via OpenGL. Fix: Go to Tools > Options > CorelDRAW > Display . Change view mode from "Enhanced" to "Normal" or "Wireframe." Disable "Use OpenGL."
CorelDRAW Portable 32-Bit: Performance and Flexibility on Any PC coreldraw portable 32 bit
Even under ideal conditions, portable versions can act up. Here is your troubleshooting checklist. The portable version is struggling with GPU acceleration