I lag so much when I use the command /fill ~~31~~31~~31 tnt only ones or multiple times

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However, this issue has been temporarily closed as Awaiting Response.

Does the lag occur from just creating the TNT, or from detonating it? Lag is expected when detonating a lot of TNT at once.

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Hello here's my response so It's when the blocks of tnt are detonated and explodes but causes the lag

Also this bug has be bothering me for a long while.

As mentioned in the previous comment, exploding such a huge amount of TNT is likely to cause a lot of lag. There will always be a point where the processor can't keep up with so much action, and having that much TNT all at once is would not occur in normal gameplay.