Slow loading of Categories and Products

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.3.24

Hi,
HikaShop test and try to make auto parts store. Customer wants the parts to choose from:
1. Category parts (brake discs, pads, ..., clutch) as there will be filters for the brand, model and modification
or
2. Category automotive brand -> Model -> Modification (Audi -> A4 -> AUDI A4 (8EC B7) -> AUDI A4 (8EC B7) 2.5 TDI - from 11.2004 to 5.2006, the 163 hp).
This requires creating a very large structure with categories of vehicles. 200 car brands we offer parts for 55-60 marks, but only Alfa Romeo and Audi have 1600 models and modifications (categories).
When the charge in the administration Components -> HikaShop -> Categories and Components -> HikaShop -> Products page load very slowly. I guess this is due to the large number of categories, which are loaded from the Explorer
I will continue to import consistent categories for BMW, CHEVROLET, CHRYSLER, ..., Volvo and VW and but I fear that general categories will be more than 30 000.
No problem in store HikaShop have 50 000 products, because they are charging 20, 50 or 100 per page, but you will be able to operate the store with 30 000 categories?
Is there a way to stop the Explorer? Options on / off or otherwise?
Thank you in advance!

Thank you !!!
The problem is called "Lost in Translation."
"Back end categories explorer" BG translation is only "Categories"
"Back end categories explorer" = "Експлорер на категориите в администрацията" or "Показва експлорер на категориите в администрацията".

I have more questions, but in a different category of the forum.
Thanks again for the quick response!