League Client Lag Fix: Low Spec Mode and Cache

Quick answer

First enable Low Spec Mode and close the client during matches. If lag remains, isolate overlays, background apps and a corrupted client cache before reinstalling.

01 / Guide

Fix in order

Client Settings → General → enable Low Spec Mode.
Enable Close Client During Game if your system is memory-limited.
Exit Riot Client fully, then restart the PC.
Disable overlays or high-memory background apps and test.
Use Riot’s repair or clean reinstall path if files are corrupt.

02 / Guide

Cache caution

Do not delete an arbitrary Riot folder while the client runs. Follow current Riot support instructions for your OS and back up logs if support requests them.

03 / Guide

Measure

Symptom	Likely area
Slow shop/champion select	Client rendering, memory or service.
Game FPS drop only	In-game graphics/driver.
High ping	Connection, not client animation.

Sources and review

Reviewed 12 October 2026. Primary reference. Confirm live codes, prices, patch notes and account rules before publication.