diff --git a/README.md b/README.md
index cb69580..82ee85a 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,12 @@ It is recommended to edit the wallpaper images in a dedicated image editor. Neve
 
 In case of errors multibg-sway logs to stderr and tries to continue. One may wish to redirect stderr if multibg-sway is being run as a daemon.
 
+### Resource usage
+
+Loaded wallpapers are stored uncompressed to enable fast wallpaper switching with nearly zero CPU use. For example for 10 full HD wallpaper this means 10*1920*1080*4 = 83 MB graphics memory use.
+
+Because multibg-sway doesn't have its own GPU context and manages graphics memory through sway, all this usage might be reported as additional memory used by the sway process.
+
 ## Installation
 
 - With Rust: