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When inserting a large image as Base64 into the Rich Text Editor, it causes delay rendering inside the Editor. So, we are suggesting uploading tiny images (below 50KB) alone as base64.
But, consider this requirement and find the feasibility to insert images up to 200KB without performance degradation. That helps to render medium size images also as Base64.
Note: The image base64 encode occupies a large size while comparing it to the original size.