I have a small Nextjs app running on the lowest tier of DigitalOcean. I am experiencing slow image rendering times, with images taking nearly 500ms to load even though they are only 1-2 KB in size. Could this delay be due to the conversion process from the original .png file to .webp? If so, how can I adjust next/image to handle both pre-converted .webp and .png files, and select the appropriate format based on browser support for .webp?