OpenLara

[jSTE0]

I got the PR XProger/OpenLara#405 to add Miyoo support merged upstream. There was support for BittBoy already so it was just to correct the button mapping for newer models, including shoulder buttons, and add support for sound.
I've made a pre-release available at https://github.com/jSTE0/OpenLara/releases. From the logs, it runs at around 11-13 fps at the stock 702 MHz.

[Apaczer]

Yeah, we were waiting for that port to finally happen! The GBA port seems to be better optimized then as it runs at 25-30fps through gpSP standalone in these devices.

[jSTE0]

The recent publicity of the GBA port is what prompted me to look for a Miyoo port and there was one already, done by the upstream author. I just did the easy bits 😄
We do have twice as many pixels to render compared to the GBA but also a 702MHz ARM926EJ-S compared to a 16MHz ARM7TDMI. Optimisations for BittBoy is on the (long) todo list for upstream so I guess that'll happen eventually (or someone here could have a go).

[Apaczer]

indeed! The resolution is bigger and the textures are more detailed, more accurate interpreter of original Tomb Raider. There is slight performance cost but it is very playable imo (comparing to GBA), albeit it has some problems with rendering 3D background (very prominent in the Mansion stage).

[jSTE0]

Nice to know you're playing it, I found the screen on my V90 to be too small for this type of game 😄

[Rezzy-dev]

In this video and test it seems to be running at around 17 FPS on the GBA hardware:

https://www.youtube.com/watch?v=_GVSLcqGP7g

The GBA port runs faster on Miyoo due to the Miyoo's faster hardware because it's using a smaller screen resolution -- which also makes it look worse. With a little tweaking, the same could be done with the direct port, bringing it to around 30 FPS speed. The main difference between the two would be a small performance gain (for avoiding an emulation layer) and no pixel blurring.

The less pixels to render in 3D using the CPU, the faster the game will run. Halve the resolution and watch the FPS skyrocket.

[jSTE0]

The GBA port runs faster on Miyoo due to the Miyoo's faster hardware because it's using a smaller screen resolution

Native or emulated it still has to render 240x160 pixels.
The improved performance under emulation is because gpSP is not cycle-accurate, from the readme:

What it lacks:

Cycle accuracy: Very cycle innacurate; CPU is effectively somewhat
 overclocked, meaning games with rampant idle loops will probably run
 rather poorly. DMA transfers effectively happen for free (0 cycle).

The GBA port has its own renderer written in ARMv4 assembler whereas the Miyoo port uses a C renderer.