I doubt you would ever notice "extreme speeds", just from enabling trim.
And, you won't see a sudden, noticeable slowdown, after you disable trim. Keep in mind that trim is just a housekeeping task, and not the only one that SSDs use. One result of housekeeping tasks can be preventing long-term performance degradation. There's nothing that will happen with trim that will make a noticeable change for you, except for the first boot or two after enabling for the first time, and you have been using the SSD for several months (or years) without trim.
And, some SSDs don't particularly need trim, when other routines on the SSD do a similar function - which would likely be why those few SSD models that macstatic found, don't really require trim enabled.