I had my Houdini 15 with some micro blocking/freezes, every 1 / 2 min…
If you have this trouble just do this !

You have to instal an other version before, that's the only way to have the good fixing.

Go in your ../Documents, where you can find this folder : “Houdini15.0” ..and of course,now, the folder of the new version
like …“Houdini16.0” for exemple.

Now just copy everything from this new version, and paste in the “Houdini15.0” folder… .

After that,… Enjoy!