LG phone internet slow with VPN — what to do next (safe checks to find the bottleneck)

Hey! If your LG phone internet is slow only when the VPN is on (pages load forever, apps time out, speed tests tank, or Wi-Fi feels fine until you connect), we can usually narrow down where the slowdown is happening without doing anything risky.

A VPN almost always adds some overhead, but “unusable slow” tends to come from one of these buckets:
• VPN endpoint issue (busy server, far location, peering problems).
• Connection type issue (slow on Wi-Fi but not mobile data, or vice-versa).
• DNS / Private DNS conflict (sites stall on “resolving,” apps half-work).
• Tunnel/path issue (MTU / fragmentation symptoms: some sites load, others hang; uploads worse than downloads).

Answer in any order (whatever you remember first):
1) Which LG model and Android version (roughly)?
2) What’s “slow” exactly — browsing, video streaming, gaming ping, downloads, uploads, or everything?
3) When did it start — after a VPN app update, after switching servers, after a phone update, or after changing Wi-Fi/network?

“Started after an update” is a great clue. A lot of people label this as VPN slowing down internet on Android or VPN slow on LG phone, but the cause is usually specific: server choice, DNS behavior, or how the VPN is tunneling traffic after the update.

Quick clarifiers (no settings changes yet):
• Does it happen on both Wi-Fi and mobile data, or only one of them?
• Is the slowdown “everything is slow” or “some apps work but browsing hangs” (that can hint at DNS)?
• Do you see the VPN connected instantly, or does it reconnect often / show “reconnecting”?

Also, when a VPN is slow, I like to separate throughput (download speed) from latency (delay). Are you noticing more “spinning/loading” (latency) or just slow downloads?

If it’s slow on both Wi-Fi and 5G, that makes a “local router only” issue less likely, and it points more toward the VPN path itself (server, protocol, or DNS inside the tunnel). The “hang at first” feeling is often either DNS resolution delay or a handshake/route delay before content starts flowing.

Let me ask in a different order to reduce risk and avoid changing too much at once:
1) Which VPN mode are you using — “full VPN” for everything, or something like split tunneling/“exclude apps”? (Even if you didn’t touch it, some updates change defaults.)
2) Are you using Private DNS on your LG (Settings → Network & Internet → Private DNS), or any ad-blocker that works via VPN (those can conflict with another VPN)?
3) Do you pick a server/country manually, or is it “auto/fastest”? If you chose a far location, slow speed is expected, but sudden slow can also mean congestion.

That’s very likely connected. A VPN already “owns” the routing for your traffic, and Private DNS forces DNS behavior at the same time. Some combinations work fine; some create exactly what you’re describing: apps feel like they have internet, but requests stall, especially right at the start of page loads (DNS lookup stage). Data Saver can add another layer by restricting background data and sometimes making apps retry more aggressively.

Important: I’m not going to tell you to disable privacy protections as “the fix.” Instead, let’s confirm whether the bottleneck is DNS-related vs VPN path/server-related with a safe test approach:
• Test A (DNS clue): With VPN on, do you see “resolving host” delays in a browser, or do downloads just crawl once they start?
• Test B (server clue): In the VPN app, can you temporarily switch from “auto” to a nearby server (same country/region) just for comparison?

One more question (risk-based): is this a personal VPN app, or a work/managed VPN profile? I ask because work profiles sometimes enforce Always-on or block non-VPN connections, which changes how troubleshooting should be done.

“Resolving host” showing up is a strong DNS hint. It doesn’t prove it’s Private DNS, but it puts DNS near the top of the suspect list. The other reason starts can be slow is handshake overhead (some protocols are heavier), but your symptom pattern is very DNS-shaped.

Here’s a safe diagnostic order (minimal disruption):
1) Compare servers inside the VPN app: try one nearby location vs auto. If one is dramatically better, it’s likely server congestion/routing rather than your phone.
2) Compare Wi-Fi vs 5G again with the same server. If both are equally slow, it’s less about your local network.
3) Check for “double VPN” conflicts: make sure no other app is running a local VPN (ad blockers, firewalls) at the same time. Android typically allows only one VPN at a time, but some apps can still interfere in confusing ways.

Since you mentioned Data Saver: if you’re seeing background apps fail while the VPN is on, that can look like “VPN kills internet,” but it’s really the system restricting background requests. Your related guide list has a good “is it the phone being slow in general” comparison too: Android phone consent screen confusing.

MTU can be relevant — but I’d treat it as “possible if the symptoms match,” not the first assumption. MTU/fragmentation issues often look like: some sites load, others partly load; uploads fail; certain apps time out; speed tests look inconsistent; and it can be worse on mobile data than Wi-Fi (or the opposite), depending on the network path.

Before going anywhere near MTU tweaks (which can be VPN-app-specific), I’d ask a few “pattern” questions to see if it fits:
1) Do you see issues on specific sites/apps (banking, streaming, app store), or is it everything?
2) Are uploads worse than downloads (sending photos, posting stories, backing up media)?
3) Does turning the VPN on make the entire phone feel slow, or only internet traffic? (If the phone itself is lagging, it’s a different direction; see battery drains overnight as a “background activity” comparison.)

Also: if your VPN app lets you choose a protocol (WireGuard / IKEv2 / OpenVPN), a safe diagnostic move is simply noting which one you’re on right now — not changing it blindly, just identifying it.

Uploads stalling is one of the better “MTU/fragmentation or path quality” hints — but it can still be plain server congestion or DNS + retries, so we’ll keep it evidence-based.

Since your VPN is set to “automatic,” here’s what I’d do next without turning this into a complicated overhaul:
• Collect two comparisons (same time window): VPN on (nearby server) vs VPN off — run the same simple actions (open 3 sites, load one app feed, send one medium upload) and note what fails first: DNS resolving, connection start, or upload progress.
• Check Android VPN controls: confirm whether Always-on VPN / “Block connections without VPN” is enabled for that profile. If it is, it can make slow VPN feel like “no internet.” (This is just a check, not a recommendation to disable.)
• Consider the “privacy stack” interaction: VPN + Private DNS + Data Saver is a lot of moving parts. The goal is to isolate which layer introduces the delay by changing only one variable at a time.

If you’re also seeing general connectivity flakiness even without VPN (Wi-Fi dropping, mobile data weird), that’s a separate track worth comparing: Android phone charging very slowly (only because system-wide power/network restrictions can sometimes correlate), and Android phone battery drains overnight (background activity context).

If you tell me whether Always-on/Block-without-VPN is enabled and whether Private DNS is “Automatic” vs a specific provider, we can pinpoint the likely bottleneck without guessing.