diff --git a/.env.example b/.env.example
index 1b2ea06..891e7f5 100644
--- a/.env.example
+++ b/.env.example
@@ -26,12 +26,16 @@ FORCE_GRAYSCALE=false
 
 # Max rendered width/height in characters.
 MAX_DIMENSION=512
+# Max rendered area (columns x rows); larger terminals are scaled down.
+MAX_TERMINAL_CELLS=256000
 
 # Memory budget in MB for the rendered-frame cache (0 disables caching).
 RENDER_CACHE_MB=256
 
 # Go soft memory limit; set below your container limit to avoid OOM kills.
 GOMEMLIMIT=1GiB
+# Docker Compose container memory limit. Leave headroom for mapped frame files.
+MEMORY_LIMIT=2g
 
 # Connection limits. New connections over a limit are dropped immediately.
 # Max simultaneous connections from a single client IP.
@@ -43,6 +47,8 @@ MAX_TOTAL_CONNECTIONS=1000
 MAX_AUTH_ATTEMPTS=3
 # SSH handshake deadline in ms (0 to disable).
 HANDSHAKE_TIMEOUT=30000
+# Maximum session lifetime in ms (0 to disable).
+SESSION_TIMEOUT=600000
 
 # Log attempted usernames/passwords.
 LOG_CREDENTIALS=true
diff --git a/docker-compose.yaml b/docker-compose.yaml
index ebc4864..6fa290d 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -3,6 +3,7 @@ services:
         image: ghcr.io/yuzuzensai/trollssh:v1.0.1
         container_name: trollssh
         restart: unless-stopped
+        mem_limit: ${MEMORY_LIMIT:-2g}
         ports:
             - "22:22"
         env_file: