Occasional ultra lagging

[boreal roost]

I was fighting Hydra, and baited her to cross the bridge before Athens' Marsh. Just after this the game started lagging ultimately. It was 1 frame per 9 seconds. As a result TQ.exe stopped responding, so I had to close the application. My question is what does cause this lagging?

Also, after restarting the game, the map is undiscovered again. Even though I've cleaned it all already.

OK, so update. Hydra here is bugged as hell. On this screenshot Hydra is actually not moving, like a statue, while everything around works properly. I guess the monster is just bugged somehow.

So what I think, is I shouldn't bait her somewhere aside her spawnspot. Either way she gets bugged too bad.

[cunning coyote]

Worth noting: occasional ultra lagging can also be caused by shooting projectiles in certain places out of bounds or in areas the game doesnt expect them to be. For example using the Goroggos staff to shoot custom fireballs instead of a normal fire beam, this glitch occured like every 30 minutes. Because these trajectories sometimes fell below the map. Since in this SS we see u working with trajectories i can only assume that it somehow messes with the bridge. Ive fought the hydra many times, luring her around but never to the bridge and ive never had any problem with her whatsoever. Still this might be helpful to some people.