I checked your issue.
You have uploaded a very larger image on the Restaurant Description (and maybe on item descriptions too)
You should not upload images directly from the RichText editor. It will convert the image into Base64 which is a large string of characters that will slow down your API response.
If you need to upload any images to the description of the restaurant or items, first upload the image to any 3rd party website. (like imgur, postimg anything)
Then get the URL of the image.
Then put the image URL on the HTML editor of the Rich text editor <img> tag.
For now, just remove everything from the Restaurant Description/Item Description and check.