Unfortunately, the chest generation can be taxing on weaker servers. It also could be caused by having too tight of requirements for the chest location (like light levels, distance, etc). What it does is basically picks a random location within the distance you specify, and then checks if that location meets the requirements. If it doesn't, it picks another spot and checks, repeat repeat repeat until it finds a spot. I plan to add a MaxChestGenRuns option for you to specify how many times it can attempt to find a spot before it gives up, thus saving your server from that lag. If you have a weaker server, you could set it to like 100 or something and you probably wouldn't notice any lag. I've had chest generation runs in the thousands of attempts on my server and it only lags a second or two even at that amount. So adding that option will be the best I can do in that regard. Or maybe I can find a way to have it space out its attempts over time. It's probably a permission issue. If you have a permissions plugin installed and the th.hunt permission isn't set to your players, they won't be able to use it. If you're not using a perms plugin or Vault at all, it will default to allowing people to use the command. So I think it's probably a perms issue. When a chest is generated the plugin picks a total value for the chest, between 0-5000, and may also draw a few more times if you have the DrawWeight set above 1. It will take the lowest value of the randomly picked numbers, and use that as the base value for the chest. The values in the config file for each item represent how much of that total value each item of that type takes up. The chest will populate with items until it hits or exceeds slightly the total value. So if you want less items in chests, set their values higher. Soon, you'll be able to set different sets of items to appear in each level of chest. Also, I'm adding multiworld support soon as well. Keep watching the bukkitdev section for this plugin. I may have it updated tomorrow. (Sorry, I've been working 50 hour weeks lately plus running my own server and programming for it, so I have neglected this plugin slightly, and I apologize for that). I have a r3 build working on my server which fixes some of the bugs in the ticket section, but I need to add those features I just mentioned in the previous paragraph before I release it. It won't take long. I'm getting pretty decent at this. As for the efficiency of the plugin...I'll probably go through and rewrite sections of it soon as well. This plugin was initially created when I was at more of a 3 or 4/10 level on minecraft plugin coding, and I'd say I'm up to about a 7 or 8/10 now.