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$15 Olimex RT1010-Py board runs MicroPython on 500 MHz NXP i.MX RT1011 Cortex-M7 MCU
(www.cnx-software.com)
Cortex-M7 isn't comparable to the Cortex-M0+, though I guess everyone wants to compare/benchmark against RP2040 / Cortex-M0+.
The important tidbits is that M7 has lightweight SIMD (packed 16-bit, not like NEON but more basic), a division instruction, and usually (but not always) comes with an FPU. Considering that NXP usually goes for the high-end MCU and/or low-end MPU with the i.MX branding, I'm guessing this chip is decked out with lots of optional features (like FPU).