I do not think that the issue has anything to do with graphic settings or graphic cards but is an issue with the workermaps, the detection of hyper threading and the allocation of particular functions to various cores/threads. I believe it to be an issue with some, but not necessarily all, Intel i7s (the older ones I think). The issue causes problems with the rubbering-in line and, I believe, the drying line.
I have 2 systems. One is an old’ish AMD processor and one a slightly newer Intel i7. The AMD will show a very obvious and impressive rubbering-in line, no problems at all. The faster, newer Intel will not. Today I have changed over the graphic card from the AMD to the Intel and it makes no difference at all. I have also copied over (from the AMD) and set as read only, the various hardwaresettings.xmls. No matter what I try I cannot succeed in getting the Intel to show the rubbering-in line. I have also put the graphics card from the Intel into the AMD and, sure enough, the rubbering-in line appears. Therefore, it would seem not to be a graphics card issue.
Obviously, both systems are running the same settings in F1 2013 and the same version of Windows 7 (64 bit) and both have the same graphics drivers, screen resolution and other windows settings. Therefore, it would not seem to be an OS issue.
So far as I can see the only difference between the 2 systems is memory and CPU. Both systems have 12GB (one is Kingston and one Crucial with the same memory timings) so I do not think that relevant. It makes no difference if the CPUs are o/c or not. Therefore, the only difference I can really see is the CPU.
I am not sure about this but I do not believe the issue afflicts all Intel CPUs but with Codemasters who knows!