loading time of the images problem during 2 seconde in home page

Hello community
I designed my website with elementor pro, hosted by O2switch (french host). Since I installed the cash management solution: LiteSpeed, I have some graphical bugs when loading the page. loading time of the images bug during 2 seconde, Not very pleasant in terms of user experience.
When I deactivate the plugin, the problem disappears.
Do you have an idea of the parameter that could be at the origin of this?
I share with you a video that presents the bug. You can also check the site in question captainblink.com.
Thank you