Hello Darko,
As model export into tiles is rather new feature, there are still options for the memory consumption optimization and speed of the process.
Is it possible to provide us the project file (with the dense cloud) for testing purposes, so that we can perform the tile export on our side and check the consumption peak? If you wish, we can also send you back the TLS file, but for this case we also need original image set.
In case you are interested, let me know and I'll send you access settings to our ftp-server for the data upload.