The program used undocumented internal system features (Native API) to clear system cache (system working set, working set, standby page lists, modified page lists) with variable result ~10-50%.
Siflower SF21H8898 specifications: CPU – Quad-core 64-bit RISC-V processor at up to 1.25 GHz Cache 32KB L1 I-Cache and 32KB L1 D-Cache per core Shared 256 KB L2 cache Memory – Up to 2GB 16-bit DDR3/3L ...