Window snapping app that shows content before mouse button released (instead of frame only)

Some weeks ago I saw a window-snapping video, moving a window "in circles", **instantly snapping every border** it touches. I thought was from native Sequoia snapping and wondered how it was much more fluent than on my up to date system. I could swear it **shows the content of the windows**, maybe it´s just sped up or tricking with hotkeys, but the mouse movement was there as far as I remember. *I am very disappointed because (Sequoia) side snapping behaviour interferes unusable with switching spaces, with the hold before release. The fact alone wasting time "waiting for the frame", just like it´s heavily lagging, drives me crazy.* *Especially in comparison to the top behaviour, where you drag just a little to snap and can instantly release while if you drag really beyond the display there is mission control.* I think I will go back to Rectangle where I can **adjust the distance between windows** too. But maybe someone knows if there is an app like described.