diff --git a/src/render/clip_path.rs b/src/render/clip_path.rs
index d65759c7..0b228053 100644
--- a/src/render/clip_path.rs
+++ b/src/render/clip_path.rs
@@ -38,8 +38,8 @@ pub fn render(
     // of more complex clipping paths, even if this means that Safari will in some cases not
     // display them correctly.
 
-    let is_simple_clip_path = is_simple_clip_path(&clip_path.root());
-    let clip_rules = collect_clip_rules(&clip_path.root());
+    let is_simple_clip_path = is_simple_clip_path(clip_path.root());
+    let clip_rules = collect_clip_rules(clip_path.root());
 
     if is_simple_clip_path
         && (clip_rules.iter().all(|f| *f == FillRule::NonZero)
@@ -49,7 +49,6 @@ pub fn render(
                 && clip_rules.len() == 1))
     {
         create_simple_clip_path(
-            group,
             clip_path,
             content,
             clip_rules.first().copied().unwrap_or(FillRule::NonZero),
@@ -94,13 +93,12 @@ fn collect_clip_rules(group: &Group) -> Vec<FillRule> {
 }
 
 fn create_simple_clip_path(
-    parent: &Group,
     clip_path: &ClipPath,
     content: &mut Content,
     clip_rule: FillRule,
 ) {
     if let Some(clip_path) = clip_path.clip_path() {
-        create_simple_clip_path(parent, clip_path, content, clip_rule);
+        create_simple_clip_path(clip_path, content, clip_rule);
     }
 
     // Just a dummy operation, so that in case the clip path only has hidden children the clip
@@ -110,7 +108,7 @@ fn create_simple_clip_path(
     let base_transform = clip_path.transform();
 
     let mut segments = vec![];
-    extend_segments_from_group(&clip_path.root(), &base_transform, &mut segments);
+    extend_segments_from_group(clip_path.root(), &base_transform, &mut segments);
     draw_path(segments.into_iter(), content);
 
     if clip_rule == FillRule::NonZero {
@@ -189,14 +187,7 @@ fn create_complex_clip_path(
 
     let pdf_bbox = bbox_to_non_zero_rect(Some(parent.bounding_box())).to_pdf_rect();
 
-    group::render(
-        &clip_path.root(),
-        chunk,
-        &mut content,
-        ctx,
-        Transform::default(),
-        None,
-    );
+    group::render(clip_path.root(), chunk, &mut content, ctx, Transform::default(), None);
     content.restore_state();
 
     let content_stream = ctx.finish_content(content);
diff --git a/src/render/gradient.rs b/src/render/gradient.rs
index d61b1860..daa777ea 100644
--- a/src/render/gradient.rs
+++ b/src/render/gradient.rs
@@ -174,7 +174,7 @@ fn function(
         // We manually pad the stops if necessary so that they are always in the range from 0-1
         if let Some(first) = stops.first() {
             if first.offset != 0.0 {
-                let mut new_stop = first.clone();
+                let mut new_stop = *first;
                 new_stop.offset = 0.0;
                 stops.insert(0, new_stop);
             }
@@ -182,7 +182,7 @@ fn function(
 
         if let Some(last) = stops.last() {
             if last.offset != 1.0 {
-                let mut new_stop = last.clone();
+                let mut new_stop = *last;
                 new_stop.offset = 1.0;
                 stops.push(new_stop);
             }
diff --git a/src/render/mask.rs b/src/render/mask.rs
index a206d599..093481e5 100644
--- a/src/render/mask.rs
+++ b/src/render/mask.rs
@@ -42,7 +42,7 @@ pub fn create(
     // circumvent a bug in Firefox where the bounding box is not applied properly for some transforms.
     // If we don't do this, the "half-width-region-with-rotation.svg" test case won't render properly.
     clip_to_rect(rect, &mut content);
-    group::render(&mask.root(), chunk, &mut content, ctx, Transform::default(), None);
+    group::render(mask.root(), chunk, &mut content, ctx, Transform::default(), None);
 
     content.restore_state();
     let content_stream = ctx.finish_content(content);
diff --git a/src/render/mod.rs b/src/render/mod.rs
index 05fe40c5..9696a8af 100644
--- a/src/render/mod.rs
+++ b/src/render/mod.rs
@@ -28,7 +28,7 @@ pub fn tree_to_stream(
     let initial_transform = initial_transform.pre_concat(ctx.get_view_box_transform());
     content.transform(initial_transform.to_pdf_transform());
 
-    group::render(&tree.root(), chunk, content, ctx, initial_transform, None);
+    group::render(tree.root(), chunk, content, ctx, initial_transform, None);
     content.restore_state();
 }
 
diff --git a/src/render/pattern.rs b/src/render/pattern.rs
index d3311cfd..657fe85a 100644
--- a/src/render/pattern.rs
+++ b/src/render/pattern.rs
@@ -38,7 +38,7 @@ pub fn create(
     }
 
     group::render(
-        &pattern.root(),
+        pattern.root(),
         chunk,
         &mut content,
         ctx,