Esp 32 Storage Issue and Options

So I'm working on a project that involves an ESP32 DevKit and a SD Card module using SPI. I'm trying to upload mainly audio files over a webserver hosted on the ESP32 but I'm only getting around 250KB/s on 60MHz. I was thinking about switching to SDIO instead of SPI or go the eMMC storage route but I was lost on how to implement an eMMC. Any Suggestions on what route to take would be highly appreciated.