Jamal,
There are other ways to serve this layer efficiently. I would explore them before you listen to advice that says your site will "probably" crash, with really no evidence given.
At 10.2, if you are licensed, you can publish that parcel layer as it's own service, using it's own site - group of ArcGIS Servers. ( I think that is what they are calling them now ).
*edit: Clusters... is the word I was looking for.