I'm running Ubuntu 16.04 on my laptop with an i5 processor and 4 GB of ram.
I have basically two issues, which are likely related each other.
The first I have is that Ubuntu boots up in something like 5 minutes or more.
Here is the output of
$ systemd-analyze blame 52.846s networking.service 45.072s dev-sda5.device 43.418s irqbalance.service 43.225s apport.service 43.065s grub-common.service 43.033s ondemand.service 42.742s speech-dispatcher.service 34.712s ModemManager.service 31.854s lightdm.service 28.636s apparmor.service 24.052s NetworkManager.service 22.293s accounts-daemon.service 13.635s polkitd.service 10.237s gpu-manager.service 8.179s systemd-udevd.service 6.594s console-setup.service 6.538s udisks2.service 6.467s thermald.service 6.450s pppd-dns.service 5.701s colord.service 5.087s rsyslog.service 4.704s plymouth-start.service 3.883s upower.service 3.621s keyboard-setup.service 3.476s systemd-tmpfiles-setup-dev.service 3.377s avahi-daemon.service 3.193s systemd-backlight@backlight:intel_backlight.service 3.070s systemd-tmpfiles-setup.service 2.887s systemd-journald.service 2.613s systemd-tmpfiles-clean.service
Moreover, all the things starts to lag depending on what I do. I checked through
htop to look for reasons, but it basically doesn't show anything that is heavily running the CPU.