mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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Masto.host

I believe the source of the issue is with Object Storage uploads. So, instances with a lot of federation will be impacted with slowdowns, while instances with less federation will not be impacted by slowdowns.

I managed to get in contact with someone at OVH and I am waiting for a call back.

Again, really sorry about this.