If your computer has suddenly started running slowly while performing task that it usually does much quicker then you may have picked up a virus or spyware somewhere and should scan your computer. If you do not have anti-spyware/malware/virus protection you can download free software such as Avast(basic/free edition), Malwarebytes' Anti-Malware, and Spybot Search & Destroy.
If it is not slow because of viruses/malware/spyware, then it may be because the program/s you are running are very memory intensive or you are running a lot of programs at the same time. Make sure that your software meets the minimum system requirements for the program/s you are running, ie. processor speed, RAM amount, video card, etc. Buying more RAM memory may help, or if you are not willing to or able to install more, you can try closing down any open applications that you don't need at that time (if there are any) to free up memory.
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It will while the program is running, but after it stops running there will be no change in computer speed.
Im not sure this is correct dude but ive heard that you must keep your computer running at all times you want the server to be up.and have the program open and running. i think that's all you need to do but if im wrong sorry.
Your computer might have too much memory for it .Your computer might be slow and old . You have too many stuff running when you install it . Has it got the right requirements ? you should check
Yes. As long as your computer meets the requirements for running Roblox, it should be able to run Roblox.
Try closing any other programs you may have running (msn, aim, raptr, yahoo, limewire, etc) If that doesn't work, unplug your router, then plug it back in. If it's still lagging, reboot your computer. If its still running slow, plug a ethernet cable into your computer directly from the router. If it's STILL lagging after that, you need either a better network connection or more RAM in your computer.