Background downloads, updates and streams: how they hurt ping

Why a download gets in the game's way

A download tries to take the whole line: it sends big packets back to back until the router and the ISP start holding them back. Game packets are small and infrequent, but they have to wait in the same queue in the router — and every wait turns into a ping spike. The longer the queue, the bigger the spike.

Uploads are the worst: the outgoing side of a home connection is usually narrower than the incoming one, and a cloud uploading photos or a stream from your PC fills it completely. The game sends every one of your actions upstream, and those packets are the first to queue.

Your plan does not save you here: even on a wide line the queue forms at the narrowest point — most often in the home router or on the line to the ISP.

Who usually takes the line

Windows updates

They download on their own, often at the worst moment, and can share updates with other PCs. The update settings have active hours, when the system does not restart, and the delivery optimization settings have speed limits.

Steam, Epic Games and other clients

An update for another game starts while you are in a match. The clients' download settings have options for downloads during gameplay and a schedule — set them once.

Clouds

Photo and document sync goes upstream over the narrow outgoing line. Pausing sync for the match is one click in the cloud's tray icon.

Torrents

Seeding continues after the download and eats the outgoing line all the time. Limit the upload speed or close the client.

Video on other devices

A TV with a show and a phone with clips share the same line and the same Wi-Fi with the game. To the router they are no better than a download.

Calls and streams

A video call or a broadcast from your own PC is a constant upstream flow. If you stream yourself, the broadcast bitrate limit is your main setting.

How to make sure downloads are the cause

1. Open Windows Task Manager, the processes tab, and sort by the “Network” column: you see right away who is downloading now.
2. Look at the list of connected devices in the router: a TV or somebody else's phone can take the line too.
3. Pause everything, turn on the ping display in the game and play a match. If ping went steady, you have found the cause.
4. Bring the sources back one at a time and watch the ping: that way you find the main culprit instead of banning everything forever.

Where to turn on the ping and loss display: Counter-Strike 2 · PUBG: Battlegrounds · Apex Legends · Fortnite · Dota 2

What to set up once

• Windows active hours for the evening when you play, and a speed limit in delivery optimization.
• In Steam, Epic Games and other clients — no downloads during gameplay and a schedule for the night.
• Pause clouds and torrents before a match; limit seeding in the torrent client by speed.
• The TV over a cable if it is next to the router: it stops competing with the game for the Wi-Fi air.
• Game priority or QoS in the router, if it has one: on a busy line the router lets the game's packets go first. On a free line there is no difference, and it should not be promised.
• An accelerator does not cure this: the queue in your router forms before the packet reaches the internet. SLARP routes the game's traffic through its own network and optimizes ping and jitter on the way to the server, but it cannot unload a download right next to it — so pause first, then compare.