Hi bloubul,
With the settings generate 40 numbers 50 lines looseness 01 (Pick 6 game?) each number will only appear once with another number. So if the numbers 6 and 10 are in an combinaton you won't see it in another combination again. In this process/calculation each generated combination will be checked against the previous -passed- generated combinations. So when a pair is found - each combination has 15 pairs- in one of the previous combinations the new generated combinations will not pass and a new combination will be randomly generated and checked again against the previous generated combinations and will pass when a pair is not found.
As you can see, when the number of combinations increases, the chance that a pair in the new generated combination will be found increases too; in other words; the generated combination will not pass and the process of generating a new combination and checking it will start again.............
So, I think your pc is not the problem it is the process of the calcualtion.
Cheers,
Harm