I can't comment of the specific integral you have. But on a test suite that contains 14,944 integrals, the following shows the average time (in seconds) used to solve each integral for different Mathematica versions
Version 12 timing is not completed yet. This shows that version 9.0 was fast compared to newer versions.
But this does not necessarily mean something bad happened.
It could be that much more error checking was added to make
Integrate more robust, and it could also be that more algorithms were added that
Integrate now tries.
And many other such things (additional pre-processing and additional post-processing, etc...). All of this would increase the time used to process each integral on average.
Of course, it could also mean that there is indeed a real issue other than the above which causes this slow down for your specific integrals.
reference: Mathematica report