Joomshopping backend very slow

Joomshopping backend very slow

Thanks for great joomshopping
I use joomshopping 4.18.4 on joomla 3.9.18 php version 7.4
The problem is like this:
Opening product page in back-end is normal but for save or cancel button in product page or category page, the speed is very very slow.
I installed joomshopping again, changed my PHP version , disable some components, change my editor but none of them doesn't solve the problem.
Can any one help me please?

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Aw: Joomshopping backend very slow

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