diff --git a/lidar_pipeline/index.py b/lidar_pipeline/index.py
index ce2de03..a142d43 100644
--- a/lidar_pipeline/index.py
+++ b/lidar_pipeline/index.py
@@ -660,8 +660,8 @@ def generate_thumbnail(src_path, thumb_path, max_size=256, mid_path=None,
             return source.resize((max(1, int(source.size[0] * scale)),
                                   max(1, int(source.size[1] * scale))), resample)
 
-        img = PILImage.open(str(src_path))
-        img = img.convert('RGB')
+        with PILImage.open(str(src_path)) as _src_img:
+            img = _src_img.convert('RGB')
         Path(thumb_path).parent.mkdir(parents=True, exist_ok=True)
         if mid_path is not None:
             try:
diff --git a/lidar_pipeline/rendering.py b/lidar_pipeline/rendering.py
index b27146a..dd7423b 100644
--- a/lidar_pipeline/rendering.py
+++ b/lidar_pipeline/rendering.py
@@ -328,6 +328,10 @@ def _download_location_map(min_x, max_x, min_y, max_y):
                 'min_y': context_min_y, 'max_y': context_max_y,
             }
             cached = (result, bounds)
+            # Éviction FIFO : chaque entrée ~12 Mo (carte ~30 km au zoom 10) —
+            # un run long sur plusieurs zones ne doit pas empiler sans limite
+            while len(_location_map_cache) >= 4:
+                _location_map_cache.pop(next(iter(_location_map_cache)))
             _location_map_cache[cache_key] = cached
             return cached
 
@@ -942,7 +946,8 @@ def generate_pdf_report(basename, vis_dir, pdf_dir, resolution):
 
                 for i, f in enumerate(situ_files):
                     ax = fig.add_subplot(gs[0, i])
-                    img = np.array(PILImage.open(str(f)).convert('RGB'))
+                    with PILImage.open(str(f)) as _pf:
+                        img = np.array(_pf.convert('RGB'))
                     ax.imshow(img)
                     ax.axis('off')
                     title = f.stem.replace(basename + '_', '').replace('_', ' ').title()
@@ -966,7 +971,8 @@ def generate_pdf_report(basename, vis_dir, pdf_dir, resolution):
 
                 for i, f in enumerate(page_files):
                     ax = fig.add_subplot(gs[0, i])
-                    img = np.array(PILImage.open(str(f)).convert('RGB'))
+                    with PILImage.open(str(f)) as _pf:
+                        img = np.array(_pf.convert('RGB'))
                     ax.imshow(img)
                     ax.axis('off')
                     title = f.stem.replace(basename + '_', '').replace('_', ' ').title()