HEAP][v4.4.3][ESP32-S3] only 225KB of the 520KB SRAM is available for the heap. Why so little? (IDFGH-8857) · Issue #10281 · espressif/esp-idf · GitHub
ESP-WROM-32 + SPIRAM is now possible - ESP32 Forum
ESP32 enable and use external ram (SPI RAM / PSRAM)