My PC is about 5 years old has Intel(R) Celeron(R) CPU 2.53GHz(Cache 256kb, frequency 2533.48MHz), RAM-1GB, Hard disk-160GB(SATA), Intel 945 Motherboard(BIOS-Phoenix Tech. version-6.00PG, Date-08/22/2008), Graphics(Inbuilt)-Intel® 945G x86/MMX/SSE2, OS-Linux Mint 14 Nadia. my CPU performance is always lies about 100%(when i run more than 1 application) but Memory and Swap Area lies lower than 50%. most of the time system hangs.suggest me to improve performance to atleast a fine level , is increasing RAM will help me? If some upgrages are needed? if Yes than what should be best for me?