Magic Trackpad 2 Lagging

Lagging is during selection of items. There is delay about 1 second. I use three finger for selecting and dragging. No issues with dragging,

My device is iMac (Retina 5K, 27-inch, Late 2015) with 24 Gb Ramm and external SSD (Samsung T5) as a system drive, OS Mojave 10.14.6.