Slowing down my website by 50 percent

I will give it five stars whenever the devs will fix the loading time of the website. Without the plugin my website loads in 0.80 – 0.85 seconds. After I activate the plugin the loading time drops to 1.35 – 1.40 seconds. If I deactivate the plugin is gonna get back to 0.8. I can understand if is loading slower before the user accepts the GDPR terms. But even after this the website drops in speed. I have no idea why this is happening and I have no idea if a website initial load is 4 seconds if is gonna drop to 6.
This is just my experience with the plugin, and except that loading time, wow, man what a plugin. If you guys don’t care about the speed this is a 5 star GDPR plugin.
Thank you.