Hot answers tagged performance
Go for the version it is suppose to be able to hold. Intel Atom N450 is 64-bit so I would stick to a 64-bit and match the minimum specs for any of the Ubuntu flavours. lUbuntu and xUbuntu are options. Beyond that: do consider alternatives that are around but not Ubuntu; like Puppy Linux or Damn Small Linux. Regarding: What will perform better, 64-bit ...
According to your computer specification, you should use 32bit system. 64bit system can use more than 4GBs of RAM, but it's useless when you have only one. What is more, 32bit would be safer for this processor. Lubuntu is the most lightweight distribution (AFAIK), so this is also good for this computer.
According to intel atom N450 supports 64bit but for performance reasons you should choose lubuntu 32 bit. Just keep in mind that some applications support only 64bit nowadays. One example is google chrome which has no 32 bit installer for linux anymore and if you use chromium you can't install flash player (you must find an older pepper flash from unofficial ...
A new and very helpful tool is cpustat It has a graphical interface that allows you to monitor multiple pids over time.
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