website & admin go too slow

I’ve made a website with the dazzling theme and it worked perfectly.
Unfortunately since few weeks i’ve seen that the website and admin go more and more slowly… but i’ve changed nothing.
Is it due to the wordpress update ? Is there a way to fix it ?
the website :

Thank you in advance for your help !

Finally it’s okay, i’ve fix it on my own. Can you delete this post please.
Thank you

Awesome great to see you got that fixed and there is no need to delete this topic.

Please advise if you have more questions.

Have a fantastic day!