This is either a misconfigured, conflicting or just poorly written mod. Should be fixed. There's absolutely no reason why sorting the inventory should have to take five seconds and freeze the client completely while doing so.

The sorting I talk about is the scroll click sort on the player inventory.

now is this a consistant freeze each time or is it a freeze once and it goes back to sorting normally because thats how it happens for me just a quick 1-3 second freeze and then every other time i sort even other inventories it is quick less than a second

After initially sorting it, it doesn't cause a delay if you try to sort it immediately after (cuz it's sorted now). But if you get your inventory cluttered again, sorting will again take a second or two.

Even the initial sorting has no reason to be this long. It seems like it does something weird like looking up/indexing all tags in existence in JEI on the initial sort instead of just sorting inventory items by item name. This mod probably was never tested on servers with huge tag list or items list.

ok i think best thing is to test it out on a new pack with just that mod (inventoryprosfilesnext) and test to see if it still does it or not, then if it does report it on their issue tracker and hopefully the developer of the mod will take a look into it?

It is a known mod conflict with the other mods that add sorting behavior

#600