This chunk loading issue has me stumped. I've got users complaining the server either lags to the point where it's unplayable or after connecting nothing loads around them. We did a large amount of testing tonight and found the problem occured with Vanilla Minecraft 1.8.1, Bukkit 1145 with no mods, Bukkit 1145 with mods (TimeFold, SimpleChestLock, WorldBorder, PermissionsBukkit, mcMMO). I've even tried newer builds of Bukkit but always downgraded back to 1145 because it did work at one point in time. The problem occurs with brand new worlds or our existing world. Oddly the problem started after this weekend (Sept 18th, 2011). My server is a Core 2 Duo 2.2Ghz, 8GB of RAM and a 100mbit down/5mbit up internet connection (Shaw Cable, Canada). We're using Java 1.6.0_26 64-bit and I've tried 1.6.0_27 with no help there running CentOS 5.7 64-bit. During testing we also tried using my Windows 7 64-bit desktop (Quad core, 4GB RAM) to run a server. No dice. Stranger still. During the day 6:00am - 4:00pm PST everything appears to be working fine. After that everything seems to go down hill. I know Canadian ISPs throttle P2P traffic during prime-time so I'm starting to think Minecraft traffic might be triggering their throttling and causing the problem. I've got a friend who literally lives across town with the same ISP and can't play on my server as well as other users from across Canada and the USA. Three questions: 1. Based on what I've written does anyone have any suggestions for me? 2. Is anyone else experiencing a similar problem? 3. Anyone else on the forums using Shaw Cable in British Columbia, Canada and having/NOT having this problem? I'm stumped.