Well, it may or may not be a "weekend fix" but it certainly is possible that you might be able to get it a bit better.
Almost every old house that has any void underneath and is suspended over piers is going to have some deflection of the floor as 100+ lbs of human pounds across it. Some spans are worse than others though, either by marginal design(too long an un or undersupported span) or through deterioration.
In some cases, simply sistering or cross bracing some joists will do the trick, in other cases adding a pier or similar new support will also help. But in many cases, a very large room will sometimes never be totally free of this type of issue, especially when paired with something high off the floor that has a propensity to "rattle" like dishes in a tall cabinet.
The worst case of this that I ever saw was(is) my parent's dining room which has an upright piano, and if you just stroll across that floor, any piece of furniture with any height noticeably moves
But in the end, if you can't get all the bounce out of the floor, you may just have to move the cabinet if it remains a nuisance.