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I realize this will sound silly. Of course a Raspberry Pi will run Dart slower than, say, a MacBook Pro. I'm about 90% sure the difference is entirely reasonable given the limitations of the device.
That said, here are a few things to note, just in case there is something going on here after all:
- Subjectively & anecdotally, the speed difference for Python on a Mac vs Raspberry Pi is smaller than the difference for Dart between those two devices
- I'm talking about the beefiest Raspberry Pi on the market at the moment, which is model 4B with a Broadcom BCM2711, Quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz and 8GB LPDDR4-3200 SDRAM.
- I'm comparing to an M1 MacBook Pro, which is also an ARM SoC (though obviously beefier), with 16GB RAM. That device already runs Dart significantly slower than an Intel-based machine, because it runs via Rosetta 2 (see Dart SDK support for macOS arm64 (Apple Silicon) #42773).
- I'm talking about single-thread performance.
- The tests below are not hitting thermal throttling (RPi reports temperature at about 60 C).
Here are some random, completely unscientific numbers:
| M1 MacBook Pro | Raspberry Pi 4 | Difference | |
|---|---|---|---|
Precompiling test executable |
7.9s | 72.0s | 9.1x |
dart run test in egb |
00:15 | 01:54 | 7.6x |
| html_unescape microbenchmark (JIT) | 24.6~25.2ms | 113.6~119.9ms | 4.6x |
dart compile exe of benchmark above |
2.92s | 19.514s | 6.7x |
| html_unescape microbenchmark.exe (AOT) | 31.4~38.9ms | 287.7~318.5 | 9.2x |
Once again, not sure if these numbers differ from reasonable expectations at all.
Possibly related: #34172.
Dart SDK Version (dart --version)
- Raspberry Pi: Dart SDK version: 2.13.0-211.0.dev (dev) (Tue Apr 6 18:41:48 2021 -0700) on "linux_arm"
- Mac: Dart SDK version: 2.12.2 (stable) (Wed Mar 17 10:30:20 2021 +0100) on "macos_x64"