Trying to improve the performance of my netbook led me to try out the Windows ReadyBoost feature. ReadyBoost is a feature that utilizes a memory stick or a memory card as a fast cache, in addition to using the slow hard disk. This works because flash memory is usually faster than a hard drive, at least in random reads/writes. So, I used my USB memory for a while and, while I did not commit any actual measurings, I felt the computer was indeed more responsive, especially when multiple programs were running simultaneously.
Because a memory stick sticking out from the side of the netbook is not a very nice feature I went ahead and bought a fast SDHC card (Class 6, 8 GB, ~14 €) to be permanently stuck into the memory card slot (which, by the way, in Asus EeePC 1101HA's case only supports SD, SDHC and MMC cards and not, for example, MemoryStick cards..). Then I formatted the card into the new exFAT file system and gave it to Windows to be used as a ReadyBoost disk.
You may think that this is a waste of money and time but as far as I can see it is never a bad idea to buy SD cards. Firstly, many, if not most, digital cameras support those. Secondly, 8 GB is quite a lot of space, so the card could well be used for copying files from one computer to another. Thirdly, you could just use it like any other drive in your computer and, for example, install another operating system (namely Linux or Chrome) to it. Running an OS from a flash disk should save the battery because flash disks only consume a fraction of power compared to the regular, spinning disks. So who knows, I might do that some day. And if I do, I will be posting about my experiences here.