Graphics questions

[jimortality]

I know graphics are personal taste but there are a couple of things I don't understand surprise surprise lol. Firstly, I realise that to get decent performance I turn shadows down to medium and that's ok but what is shadow blur? I think some games have options like fast, quality, optimal and GSCE is just on or off. Also, anti aliaising is to help with jaggies but what do I need if my tyres show a very slight hexagon shape? I'm being really picky here and it's not noticable when at speed but when I leave the pits, my wheels don't always look perfectly round on some of the open wheelers. There are a lot of options for graphics but it would help If I knew what some of them did before I start messing.

Cheers