The 1st implementation of a third-party effect or transition takes up to 10 seconds to load

The thing I noticed in the current v25 of Premiere Pro is that all the third-party plugins with effects or transitions now take up to 10 seconds to load for the first time. Then they apply instantly but the very first implementation of any of them takes this long.

I first thought it might be connected with the fact that Premiere Pro is now version 25, it's new so the plugins also should be all up to date though there's never been anything like this in the previous versions of Premiere Pro efven if I used really old versions of third-party plugins. So to check my theory I installed the newest 2025 version of the Film Impact plugin pack and the BorisFX Continuum. Guess what - the ploblem is still there even with the newest versions of those plugins. So I am convinced it's Premiere Pro's new mechanism that makes the plugins take so much time to load for the first time.

Of cource I tried resetting Pr's preferences (the plugins cache including), clearing cache, reinstalling both Pr and the plugins, nothing helps. For the final check I installed the 24.6.3 version of Premiere Pro and there's no such problem there - all the plugins load instantly no matter what version they are.

Steps to reproduce:

Open Premiere Pro, create an empty project, import any media, go to effects, choose and apply any third-party effect - wait. In this video below it's clearly seen that the first time an effect is applied it takes Premiere Pro very long to load it. But all the other implementations of any other effect from this same pack or folder the effects are applied instantly. Don't pay attention to the worning message from the first effect that it shuold be used in Ae, it doesn't matter.

Also pay attention to how long it takes Premiere Pro to load a new empty project. I think it may be connected.

Premiere Pro 25, i7 14700K, RTX 4080, 64 Gb Ram, fast SSDs only, Win11 23h2