一台较旧的（2011 年）1.7Ghz SSD 机器配备了 16.04 和 8GB 的 RAM。总体性能还不错，但是 Firefox 运行速度很慢。通常情况下，RAM 的使用率不到 50%。
有什么设置或技巧可以提高速度？ Firefox 响应速度？谢谢
user@host:~$ lspci -k | grep -EA3 'VGA|3D|Display'
01:00.0 VGA compatible controller: NVIDIA Corporation GT218M [NVS 3100M] (rev a2)
DeviceName: 0
Subsystem: Hewlett-Packard Company GT218M [NVS 3100M]
Kernel driver in use: nvidia
user@host:~$ free -h
total used free shared buff/cache available
Mem: 7.7G 2.7G 1.2G 135M 3.8G 4.5G
Swap: 7.9G 15M 7.9G
user@host:~$ swapon -s
Filename Type Size Used Priority
/dev/sda5 partition 8311804 16352 -1
user@host:~$ dpkg -l intel-microcode | grep ii
ii intel-microcode 3.20151106.1 amd64 Processor microcode firmware for Intel CPUs
CPU详细信息：
user@host:~$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 30
Model name: Intel(R) Core(TM) i7 CPU Q 740 @ 1.73GHz
Stepping: 5
CPU MHz: 933.000
CPU max MHz: 1734.0000
CPU min MHz: 933.0000
BogoMIPS: 3457.66
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 6144K
NUMA node0 CPU(s): 0-7
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm tpr_shadow vnmi flexpriority ept vpid dtherm ida