Why Primegrid give very small points of Genefer but required much more time then CW Sieve and PPs Sieve?

Because if you run genefer tasks you have the chance to find a very big prime number like the one bellow (actually, a lot bigger than that now). With other gpu tasks (CW sieve and PPS sieve) you are only eliminating non prime numbers from a large list of candidates (your are sieving).
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676754^262144+1 is prime

Ok but volume of calculations is much higher than then CW Sieve and PPs Sieve and I think that for Genefer points should be given in proportion to the volume of calculations

I personally think each project under Primegrid is it's own. Plus Sieve and Prime searching are two different beasts. Another major difference, Sieve you are looking at a lot of numbers in one file. The Prime you are looking a single number. They are also very different applications. With all that in mind, each one has it's own calculations and I feel that they are pretty fair in their own right.

Some people are in it for the points, some for the elusive Prime. I am in it for a lot of things and am happy I have found some pretty neat primes.

There are a lot of different factors being different on the different projects and points do not follow time, they follow the work being done.