Hello Juan,
Congrats on the new release! Appreciate you and the teams hard work to make PI a fabulous platform and to continue to improve it for all of us!
I am running 1.8.7 on a Mac pro. Sorry, don't have the specifics of the OS as I am not in front of that system right now. It's definitely running the latest version though for sure.
I can say I've noticed a slight lag in some things. For instance, dragging an instance icon, or even blue triangle to an image exhibits a slight delay prior to operation kicking in and seeing spinning color wheel. This was not exhibited in 1.8.6.xxx for me.
Another, worse item I am experiencing is the RealTimePreview. I am noticing a rendering delay of at least 30 seconds, and sometimes into minutes in the preview window when I initially launch it and make parameter changes in the associated tool. I've rebooted, and restarted PI 1.8.7 but the problem persists.
I initially installed 1.8.7 when released and have seen 1 update and have applied that as well.
I've reverted to 1.8.6 and the issue is not present.