在 Ubunustudio 上，有时网站加载速度很慢。当我第一次访问该站点时（例如在 google 中查找某些内容），这种情况会更频繁地发生。该问题发生在 Firefox 和 Chromium 中。我已经尝试禁用 IP6，但没有帮助。除此之外还有什么我可以测试的吗？下载和上传速度都很好，我猜可能是由于解析地址？
我的系统：
System:
Host: marco-MS-7817 Kernel: 5.4.0-47-lowlatency x86_64 bits: 64
Desktop: Xfce 4.14.2 Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:
Type: Desktop Mobo: MSI model: H81M-E34 (MS-7817) v: 3.0
serial: <superuser/root required> BIOS: American Megatrends v: 17.5
date: 03/30/2015
CPU:
Topology: Quad Core model: Intel Core i5-4460 bits: 64 type: MCP
L2 cache: 6144 KiB
Speed: 3200 MHz min/max: 800/3200 MHz Core speeds (MHz): 1: 3200 2: 3200
3: 3200 4: 3200
Graphics:
Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics
driver: i915 v: kernel
Display: x11 server: X.Org 1.20.8 driver: modesetting unloaded: fbdev,vesa
resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa DRI Intel HD Graphics 4600 (HSW GT2)
v: 4.5 Mesa 20.0.8
Audio:
Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio
driver: snd_hda_intel
Device-2: BEHRINGER UMC204HD 192k type: USB driver: snd-usb-audio
Device-3: AKAI Professional M.I. type: USB
driver: hid-generic,snd-usb-audio,usbhid
Sound Server: ALSA v: k5.4.0-47-lowlatency
Network:
Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
driver: r8169
IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: d8:cb:8a:e8:e9:99
Drives:
Local Storage: total: 523.08 GiB used: 159.23 GiB (30.4%)
ID-1: /dev/sda vendor: Samsung model: SSD 850 EVO 250GB size: 232.89 GiB
ID-2: /dev/sdb type: USB vendor: Samsung model: Portable SSD T5
size: 232.89 GiB
ID-3: /dev/sdc type: USB vendor: SanDisk model: Ultra size: 57.30 GiB
Partition:
ID-1: / size: 36.41 GiB used: 12.45 GiB (34.2%) fs: ext4 dev: /dev/sda1
ID-2: /home size: 184.23 GiB used: 66.59 GiB (36.1%) fs: ext4
dev: /dev/sda6
ID-3: swap-1 size: 7.45 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda5
Sensors:
System Temperatures: cpu: 41.0 C mobo: N/A
Fan Speeds (RPM): N/A
Info:
Processes: 260 Uptime: 20m Memory: 7.23 GiB used: 3.97 GiB (54.9%)
Shell: bash inxi: 3.0.38
编辑：
sudo lshw -C network
[sudo] Passwort für marco:
*-network
Beschreibung: Ethernet interface
Produkt: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
Hersteller: Realtek Semiconductor Co., Ltd.
Physische ID: 0
Bus-Informationen: pci@0000:02:00.0
Logischer Name: enp2s0
Version: 0c
Seriennummer: d8:cb:8a:e8:e9:99
Größe: 1Gbit/s
Kapazität: 1Gbit/s
Breite: 64 bits
Takt: 33MHz
Fähigkeiten: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
Konfiguration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl8168g-2_0.0.1 02/06/13 ip=192.168.178.23 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
Ressourcen: irq:18 ioport:e000(Größe=256) memory:f7d00000-f7d00fff memory:f0000000-f0003fff
ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether d8:cb:8a:e8:e9:99 brd ff:ff:ff:ff:ff:ff
inet 192.168.178.23/24 brd 192.168.178.255 scope global dynamic noprefixroute enp2s0
valid_lft 862605sec preferred_lft 862605sec
@tracepath
当我执行它时，一开始我会得到 1500，但第二次我得到 1492，这似乎是更好的价值。也许这解释了为什么我第一次尝试加载页面时有时会遇到问题。在哪里可以将 MTU 永久设置为 1492？
tracepath www.google.com
1?: [LOCALHOST] pmtu 1500
1: fritz.box 7.938ms
1: wpad.fritz.box 1.830ms
2: x4db53c5a.dyn.telefonica.de 2.639ms pmtu 1492
2: loopback1.0003.acln.02.fra.de.net.telefonica.de 14.828ms
3: bundle-ether30.0004.dbrx.02.fra.de.net.telefonica.de 16.144ms
4: bundle-ether1.0004.prrx.02.fra.de.net.telefonica.de 15.519ms
5: 72.14.213.76 16.803ms asymm 10
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Too many hops: pmtu 1492
Resume: pmtu 1492
更多信息于 9 月 28 日添加....
链接到具有 MTU 设置的图像文件：https ://imgur.com/AOiPxjE.png
systemd-resolve --status
Global
LLMNR setting: no
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no
DNS Domain: fritz.box
DNSSEC NTA: 10.in-addr.arpa
16.172.in-addr.arpa
168.192.in-addr.arpa
17.172.in-addr.arpa
18.172.in-addr.arpa
19.172.in-addr.arpa
20.172.in-addr.arpa
21.172.in-addr.arpa
22.172.in-addr.arpa
23.172.in-addr.arpa
24.172.in-addr.arpa
25.172.in-addr.arpa
26.172.in-addr.arpa
27.172.in-addr.arpa
28.172.in-addr.arpa
29.172.in-addr.arpa
30.172.in-addr.arpa
31.172.in-addr.arpa
corp
d.f.ip6.arpa
home
internal
intranet
lan
local
private
test
Link 2 (enp2s0)
Current Scopes: DNS
DefaultRoute setting: yes
LLMNR setting: yes
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no
Current DNS Server: 192.168.178.1
DNS Servers: 192.168.178.1
DNS Domain: ~.
fritz.box
lines 25-47/47 (END)
31.172.in-addr.arpa
corp
d.f.ip6.arpa
home
internal
intranet
lan
local
private
test
Link 2 (enp2s0)
Current Scopes: DNS
DefaultRoute setting: yes
LLMNR setting: yes
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no
Current DNS Server: 192.168.178.1
DNS Servers: 192.168.178.1
DNS Domain: ~.
fritz.box
~
ls -al /etc/resolv.conf
lrwxrwxrwx 1 root root 29 Sep 27 22:10 /etc/resolv.conf -> ../run/resolvconf/resolv.conf
cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.53
search fritz.box
dpkg -l *dnsmasq* | grep ii
ii dnsmasq-base 2.80-1.1ubuntu1 amd64 Small caching DNS proxy and DHCP/TFTP server