Metabase hosted on metabase slow depending on the day


We have metabase hosted by metabase and on some days metabase is very slow taking minutes for one question when it works perfectly fine on another day. We have the same number of users everyday. Could you tell us if ther is anything we can do to solve this ?

Well, clearly you have to see the load of the dw here

Yes but why would the speed depend on the day/hour considering we have a constant number of user ?