diff --git a/.env.example b/.env.example
index 0ab1d9b..f38002f 100644
--- a/.env.example
+++ b/.env.example
@@ -4,9 +4,9 @@ S3_USE_SSL=false
 S3_ACCESS_KEY=minioadmin
 S3_SECRET_KEY=minioadmin
 S3_SESSION_TTL_SECONDS=3600
-CONVERSION_IMAGE_DPI=150
+CONVERSION_IMAGE_DPI=72
 CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS=180
-CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS=600
+CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS=1800
 CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS=45
 CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS=3
 CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS=30
diff --git a/Makefile b/Makefile
index 0720e7d..deee93d 100644
--- a/Makefile
+++ b/Makefile
@@ -37,7 +37,7 @@ run-server:
 	export S3_SESSION_TTL_SECONDS="$${S3_SESSION_TTL_SECONDS:-3600}"; \
 	export CONVERSION_IMAGE_DPI="$${CONVERSION_IMAGE_DPI:-72}"; \
 	export CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS="$${CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS:-180}"; \
-	export CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS="$${CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS:-600}"; \
+	export CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS="$${CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS:-1800}"; \
 	export CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS="$${CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS:-45}"; \
 	export CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS="$${CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS:-3}"; \
 	export CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS="$${CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS:-30}"; \
diff --git a/README.md b/README.md
index 0b41205..7f58913 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,6 @@ Use `.env.example` as your baseline env configuration.
 
 If conversion fails on larger decks, tune these environment variables:
 
-- `CONVERSION_IMAGE_DPI` (default `150`): lower values reduce image generation time.
+- `CONVERSION_IMAGE_DPI` (default `72`): lower values reduce image generation time.
 - `CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS` (default `180`): timeout for LibreOffice export.
-- `CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS` (default `600`): timeout for Poppler rasterization.
+- `CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS` (default `1800`): timeout for Poppler rasterization.
diff --git a/deploy/docker-compose.yml b/deploy/docker-compose.yml
index b04cf0c..190e980 100644
--- a/deploy/docker-compose.yml
+++ b/deploy/docker-compose.yml
@@ -29,7 +29,7 @@ services:
       S3_SESSION_TTL_SECONDS: ${S3_SESSION_TTL_SECONDS:-3600}
       CONVERSION_IMAGE_DPI: ${CONVERSION_IMAGE_DPI:-72}
       CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS: ${CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS:-180}
-      CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS: ${CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS:-600}
+      CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS: ${CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS:-1800}
       CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS: ${CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS:-45}
       CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS: ${CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS:-3}
       CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS: ${CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS:-30}
diff --git a/python/packages/officeconvert/src/officeconvert/conversion.py b/python/packages/officeconvert/src/officeconvert/conversion.py
index f95e42e..db35a8b 100644
--- a/python/packages/officeconvert/src/officeconvert/conversion.py
+++ b/python/packages/officeconvert/src/officeconvert/conversion.py
@@ -107,7 +107,7 @@ def render_pdf_to_images(
     pdf_path: Path,
     out_dir: Path,
     *,
-    dpi: int = 180,
+    dpi: int = 72,
     image_format: str = "png",
     timeout_s: int = 120,
     total_pages: int | None = None,
@@ -254,10 +254,10 @@ def convert_pptx_to_slidedeck(
     pptx_path: Path,
     work_dir: Path,
     *,
-    dpi: int = 180,
+    dpi: int = 72,
     image_format: str = "png",
     pptx_to_pdf_timeout_s: int = 180,
-    pdf_to_images_timeout_s: int = 600,
+    pdf_to_images_timeout_s: int = 1800,
     pptx_to_pdf_base_timeout_s: int = 45,
     pptx_to_pdf_per_slide_timeout_s: int = 3,
     pdf_to_images_base_timeout_s: int = 30,
diff --git a/python/packages/server/src/officeconvert_server/config.py b/python/packages/server/src/officeconvert_server/config.py
index 5d4eb52..c2fd76a 100644
--- a/python/packages/server/src/officeconvert_server/config.py
+++ b/python/packages/server/src/officeconvert_server/config.py
@@ -40,7 +40,7 @@ def load_server_config() -> ServerConfig:
             os.getenv("CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS", "180")
         ),
         conversion_pdf_to_images_timeout_seconds=int(
-            os.getenv("CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS", "600")
+            os.getenv("CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS", "1800")
         ),
         conversion_pptx_to_pdf_base_timeout_seconds=int(
             os.getenv("CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS", "45")