Recompiling the kernel causes the CPU USE% to decrease

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In RHEL8.1BETA,when I recompiled the kernel with kernel-4.18.0-107.el8.src.rpm file,I found that the throughput value measured using Iperf has risen and the %use of the CPU has decreased.

Here are the steps I have to recompile the kernel.

1.# rpm -ivh kernel-4.18.0-107.el8.src.rpm
2.# cd /root/rpmbuild/SPEC
3.# rpmbuild -bp kernel.spec
4.# cd /root/rpmbuild/BUILD/kernel-4.18.0-107.el8/linux-4.18.0-107.el8.x86_64
5.# cp /boot/config-4.18.0-107.el8.x86_64 .config
6.# make -j56
7.# make
8.# make modules_install
9.# make install

I want to know why just recompiling the kernel will cause this situation.

Thanks

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