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This is great. Thanks for sharing.

1) I know that google caches those thumbnails and returns a thumbnail instantly when it does have a cached version, do you know what happens when it does not?

2) have you come across any rate limit?

Glad you enjoyed it.

1) The PageSpeed service takes some time to run, so it always returned a new image in my tests.

2) I haven't - but I wasn't stress testing it. It happily coped with a few dozen per hour.