diff --git a/.gitignore b/.gitignore
index 496ee2c..fd799ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,4 @@
-.DS_Store
\ No newline at end of file
+.DS_Store
+
+# Download file is now generated at build time via Dockerfile
+files/www/downloading
diff --git a/Dockerfile b/Dockerfile
index e4e3bbf..acab2d8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,6 +15,10 @@ ENV HTTP_PORT=3000
 ENV HTTPS_PORT=3001
 ENV SET_USER=101
 
+# Build arguments for generating download file at build time
+ARG FILE_SIZE=31457280
+ARG FILE_NAME=downloading
+
 COPY /files/OpenSpeedTest-Server.conf ${CONFIG}
 COPY /files/entrypoint.sh /entrypoint.sh
 COPY /files/renew.sh /renew.sh
@@ -28,15 +32,23 @@ COPY /files/nginx.key /etc/ssl/
 
 USER root
 VOLUME /var/log/letsencrypt
+
+# Generate random download file at build time (30MB by default)
+# This reduces repository size and ensures unique test data per build
+RUN apk add --no-cache --virtual .build-deps coreutils && \
+    dd if=/dev/urandom of=/usr/share/nginx/html/$FILE_NAME bs=1 count=$FILE_SIZE && \
+    apk del .build-deps && \
+    rm -rf /var/cache/apk/*
+
 RUN rm -rf /etc/nginx/conf.d/default.conf \
-	&& chown -R nginx /usr/share/nginx/html/ \
-	&& chmod 755 /usr/share/nginx/html/downloading \
-	&& chmod 755 /usr/share/nginx/html/upload \
-	&& chown nginx ${CONFIG} \
-	&& chmod 400 ${CONFIG} \
-	&& chown nginx /etc/nginx/nginx.conf \
-	&& chmod 400 /etc/nginx/nginx.conf \
-	&& chmod +x /entrypoint.sh \
+    && chown -R nginx /usr/share/nginx/html/ \
+    && chmod 755 /usr/share/nginx/html/$FILE_NAME \
+    && chmod 755 /usr/share/nginx/html/upload \
+    && chown nginx ${CONFIG} \
+    && chmod 400 ${CONFIG} \
+    && chown nginx /etc/nginx/nginx.conf \
+    && chmod 400 /etc/nginx/nginx.conf \
+    && chmod +x /entrypoint.sh \
 	&& chmod +x /renew.sh
 
 
@@ -56,7 +68,7 @@ RUN mkdir -p /var/log/letsencrypt && \
 RUN mkdir -p /usr/share/nginx/html/.well-known/acme-challenge && \
     chown -R nginx /usr/share/nginx/html/.well-known/acme-challenge && \
     chmod 775 /usr/share/nginx/html/.well-known/acme-challenge
- 
+
 RUN apk update && apk add ca-certificates && rm -rf /var/cache/apk/* 
 RUN update-ca-certificates
 RUN apk add --no-cache certbot certbot-nginx
diff --git a/files/www/downloading b/files/www/downloading
deleted file mode 100644
index b78c32f..0000000
Binary files a/files/www/downloading and /dev/null differ