During our port of the MicroPython bytecode interpreter to the CHERI-based Arm Morello platform, we encountered a number of serious performance degradations. This paper explores several of these of these performance issues in detail, in each case characterizing the cause of the problem, the fix, and the corresponding performance improvement over a set of standard Python benchmarks. While we recognize that Morello is a prototypical physical instantiation of the CHERI concept, we show that it is possible to eliminate certain kinds of software-induced runtime overhead that occur due to the larger size of architectural capabilities relative to native pointers. In our case, we reduce a geometric mean benchmark slowdown from 5x (before optimization) to 2x (after optimization) relative to AArch64 execution. The worst-case slowdowns are greatly improved, from 100x (before optimization) to 2x (after optimization). The key insight is that pointer size assumptions pervade systems code; whereas previous CHERI porting projects highlighted compile-time and execution-time errors exposed by pointer size assumptions, we instead focus on the performance implications of such assumptions.