Huge difference between DLL sizes with /TC and /TP options

Hello MS Support,

We get alomost 10 times larger DLL size when our CPP code is compiled with /TC (as C code) compared to default /TP option (as CPP code).  It's contrary to what could be expected i.e. size of library built as C code is much higher.

The code performance in terms of speed and output results of both options match.

What can be the reason for such a huge difference and that also with larger C library size?

Thanks,

Regards,

Purushottam Ekande