This is an old HP EliteBook 8530p laptop (4GB RAM) running an up-to-date Kubuntu 14.04.5 LTS / x86_64 with gcc 4.8.4 (nothing fancy is installed / added).
Note that, the newest ROOT 6.11/02 binary release (for Ubuntu 14 gcc4.8) behaves even worse.
This is an old HP EliteBook 8530p laptop (4GB RAM) running an up-to-date Kubuntu 14.04.5 LTS / x86_64 with gcc 4.8.4 (nothing fancy is installed / added).
Note that, the newest ROOT 6.11/02 binary release (for Ubuntu 14 gcc4.8) behaves even worse.