Embed iframe tag in grid-item, dragging is not smooth

[V-yw]

Software version (please complete the following information):

• Browser chrome
• Vue.js v2.7.14
• vue-grid-layout - 2.4.0

Embed iframe tag in grid-item, dragging is not smooth

1. When I don’t embed any tags and use index, there is no problem
2. When I use the img tag, dragging is also smooth.
3. When I use iframe, the src is jpg, and there is an obvious lag when dragging. Some specific phenomena are that the mouse click is not actually detected, etc. There is a clear contrast. Remove the iframe and it will return to normal

[V-yw]

For example, drag a drag up.