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Even though I didn't experience any problems using Talkimg image hosting, I also found several other people's image posts on several boards that looked damaged and displayed the words image proxy invalid image.
Is it possible that my internet network is weak so the display of other people's image posts is invalid even though the image hosting they use is imgbb.
If you find that the image is invalid even though they used imgbb, then it is very likely that they did not use the image code correctly. Full BBcode links are valid image to use for forum, while others will likely be invalid. So I think it's not a problem with your internet connection being slow, but rather using the link code incorrectly.