7.0.0 (2) new Linux Mint instalation calendar loading time problem

We have a problem after installation v7.0.0 (2) on new computer, very slow data loading.
We have our v7.0.0 installed on old computer, and its working fine without any problem.
We decided to move our data to brand new Intel i7 computer. Installation very clear no any problems. But even before restoring data, very slow loading respond on calendar and patients, taking up to 60 seconds.
We did re installation 3 times, and always same problem. We tried restore data from v.6.0.0 and respond very fast, but after return to 7.0.0. same problem, very slow respond.
Please let me know how to resolve this problem