Many of the users coming to the blog have asked about the client lag of Tera Online and have been asking for more information on what causes it. Many of them say that they have really well built computers but still experience client lag. So for today I will explain what causes Tera's client lag and more detailed information so you can get an idea why the other topics for tweaking tera's client settings makes the game run more smoothly.
The biggest problem with Tera Onlines client is the way they built the UI system. This system as said before is built using autodesk scaleform which is a flash based system. The problem with using flash for any well built game is that flash uses your CPU for its process this also means if your running flash videos in the background or other flash based programs your system performance in Tera Online will be greatly degraded. The mix between using flash's CPU process and then mixing that with video graphics from the GPU and unreal engine causes a major delay in the client communications and that's why skills can also seem like they have some sort of delay bug. I've experience that as well but in the most current update it seems to be slightly improved.
The bad thing is because Tera Online most likely has no plans on changing this system chances are there might not be a incoming fix for this so all we can do is continue to tweak the game client in various ways hoping that it smooth's out enough to the point that its playable.
One thing that you do have to consider if you've tried some of the tweaking to your client and are still running into issues remember that like I said flash is CPU based so if your processing power is really low you'll end up with a bottleneck between your CPU and GPU processes. Bottlenecking means that your CPU or GPU is having a loss of performance because of a single or limited number of components or resources. When your GPU bottlenecks its because you are lacking the CPU processing power and because of that your game lacks the processing. Since the UI system in Tera is based on CPU and the graphics system is based on GPU the mix of these two components cause a lag within the clients interface. But with computer that is lacking CPU processing this lag will increase by much more then the average user. So if you barely meet the minimum requirements for your CPU to play Tera Online chances are your game is sitting around 10-20 fps even if your graphic card is really amazing. Upgrading your CPU in that case would be recomended to see better performance.