So I re-installed X-plane after waiting for FS2020 (because I upgraded my machine and started fresh) and re-installed 圎nviro 1.13 having last tried it before volumetric clouds.

I think it looked decent and had good features. However, It runs at 30-40 FPS if it's lucky and even though the sim reports 30fps, it still seems to have a micro stutter. For reference stock, X-plane will hit 70+fps easy on my machine.

Be advised that SkyMaxx Pro is more of a texture addon rather than a weather engine. And I was kinda bummed to be losing 50% fps. It basically just changes the way the clouds look, among a few other visuals. However, SkyMaxx Pro is advertised to improve FPS over default clouds and in my opinion, it does improve FPS. You can also adjust the detail of the clouds to tailor to your machine. So I installed Skymaxx pro, w/ real weather connecter (something I purchased back when Skymaxx was the only addon for X-Plane). I wasn't thrilled with the weather it offers out of the box (it's basically cloud replacements).SO I purchased active sky XP and also fired up my old x-vision presets, to try and get the atmosphere back on track. I got this setup generally where it is decent, climbed to 30k feet and noticed the cloud draw distance that plagues default X-plane.

No biggy I can make that way bigger with Skymaxx.

Active sky xp and skymaxx pro