Since you barely have resource to run Bitcoin Core, i need to ask why do use Bitcoin Core? If you only plan to store Bitcoin, using lightweight wallet such as Electrum and Wasabi wallet might be better option.
My computeris 4 years old. Not a very fast one i think. Use windows 10. HDD 0.5 TB. But for the other like bandwith or so? i really don't kwow and where i can find an answer for this.
To know your bandwidth, use this website
https://www.speedtest.net/. When perform test, choose server from different country because local and international speed sometimes is different.
To see your CPU/RAM, see this guide
http://solverbase.com/w/Windows_10:_How_To_See_Processor_%26_RAM_SpecsI have just done the speedtest from the link you posted and it gives 91,09 Mbps. Is that good?