这是我的启动时间：
Startup finished in 2ms (firmware) + 5ms (loader) + 4.414s (kernel) + 1min 13.694s (userspace) = 1min 18.116s
graphical.target reached after 1min 13.617s in userspace
系统错误结果：
30.765s plymouth-quit-wait.service >
18.802s dev-sda3.device >
17.134s snapd.service >
15.556s networkd-dispatcher.service >
13.260s udisks2.service >
12.570s accounts-daemon.service >
12.097s NetworkManager-wait-online.service >
10.391s klnagent64.service >
9.613s polkit.service >
9.596s systemd-journal-flush.service >
8.729s NetworkManager.service >
8.672s avahi-daemon.service >
8.669s bluetooth.service >
8.442s dev-loop4.device >
8.147s dev-loop2.device >
7.805s plymouth-read-write.service >
7.658s switcheroo-control.service >
7.569s thermald.service >
7.567s systemd-logind.service >
7.564s wpa_supplicant.service >
7.218s dev-loop1.device >
7.158s dev-loop5.device >
7.068s dev-loop3.device
系统规格：
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
Model name: Intel(R) Core(TM) i3-3110M CPU @ 2.40GHz
禁用哪些服务可以减少启动时间？