In brief
Early readability may be followed by a change of arrangement.
Useful to know
font-display manages the behavior while loading a font described with @font-face. swap allows a very short blocking period, after which the text is displayed with a backup font and can be replaced with downloads. [1]
Example: add font-display: swap; in the corresponding @font-face block. Different widths of glyphs can change the lines in the replacement. Choose a close backup font and check the titles, buttons and shapes . swap does not mean fixed time in milliseconds and does not negate the need for optimized font resources.
Sources
For further detail and to check the information: