When crafting a stack of anything for example, when shift-clicking to put the stack into inventory, one will move, the other 63 will persist in the product slot of the crafting table, then after like 4 or 5 seconds, the other 63 will move to your inventory. (Courtesy of Clover).

The lag increases based on the number of items used to craft that item and how many of the item the user shift-clicks into the inventory.

This problem has existed for a long time. The earliest I can remember is the 2.4.0 versions.

Steps to Reproduce:

1. Get 9 stacks of iron ingots
2. Put in crafting grid and shift-click the iron blocks
3. One should appear in the inventory and the rest will appear after 2-3 sec of lag.

This issue does not seem to appear on the AE2 crafting panel.

In case it's helpful: 2019 Mac running MultiMC.

this problem can be fixed by adding the FastBench mod to the pack

This was a while ago, but just wanted to check if you remember which type of crafting table you were using? Was it just the vanillla crafting table, or was it the one with the legs (Tinkers Construct type) - or something else?

It was with the regular crafting table.

SP. Haven't test on MP.

sp or mp? and if mp.. is it the aof public servers?

could be related to sorting issues.