diff --git a/examples/editor-libcosmic/src/main.rs b/examples/editor-libcosmic/src/main.rs
index c7693ee..e8e4579 100644
--- a/examples/editor-libcosmic/src/main.rs
+++ b/examples/editor-libcosmic/src/main.rs
@@ -19,7 +19,7 @@ use cosmic_text::{
 use std::{
     env,
     fs,
-    sync::{Arc, RwLock},
+    sync::{Arc, Mutex},
 };
 
 use self::text_box::text_box;
@@ -73,7 +73,7 @@ fn main() -> cosmic::iced::Result {
 }
 
 pub struct Window {
-    buffer: Arc<RwLock<TextBuffer<'static>>>,
+    buffer: Arc<Mutex<TextBuffer<'static>>>,
 }
 
 #[allow(dead_code)]
@@ -108,7 +108,7 @@ impl Application for Window {
             default_text.to_string()
         };
 
-        let buffer = Arc::new(RwLock::new(TextBuffer::new(
+        let buffer = Arc::new(Mutex::new(TextBuffer::new(
             unsafe { FONT_MATCHES.as_ref().unwrap() },
             &text,
             font_sizes[font_size_i].0,
@@ -124,7 +124,7 @@ impl Application for Window {
     }
 
     fn title(&self) -> String {
-        let buffer = self.buffer.read().unwrap();
+        let buffer = self.buffer.lock().unwrap();
         format!("COSMIC Text - iced - {}", buffer.font_matches().locale)
     }
 
diff --git a/examples/editor-libcosmic/src/text_box.rs b/examples/editor-libcosmic/src/text_box.rs
index c7498c7..e03a315 100644
--- a/examples/editor-libcosmic/src/text_box.rs
+++ b/examples/editor-libcosmic/src/text_box.rs
@@ -16,21 +16,21 @@ use cosmic_text::{
     TextBuffer,
 };
 use std::{
-    sync::{Arc, RwLock},
+    sync::{Arc, Mutex},
     time::Instant,
 };
 
 pub struct TextBox<'a> {
-    buffer: Arc<RwLock<TextBuffer<'a>>>,
+    buffer: Arc<Mutex<TextBuffer<'a>>>,
 }
 
 impl<'a> TextBox<'a> {
-    pub fn new(buffer: Arc<RwLock<TextBuffer<'a>>>) -> Self {
+    pub fn new(buffer: Arc<Mutex<TextBuffer<'a>>>) -> Self {
         Self { buffer }
     }
 }
 
-pub fn text_box<'a>(buffer: Arc<RwLock<TextBuffer<'a>>>) -> TextBox<'a> {
+pub fn text_box<'a>(buffer: Arc<Mutex<TextBuffer<'a>>>) -> TextBox<'a> {
     TextBox::new(buffer)
 }
 
@@ -54,7 +54,7 @@ where
         println!("{:?}", limits);
         let size = limits.max();
         {
-            let mut buffer = self.buffer.write().unwrap();
+            let mut buffer = self.buffer.lock().unwrap();
 
             buffer.set_size(size.width as i32, size.height as i32);
         }
@@ -71,7 +71,8 @@ where
         _cursor_position: Point,
         _viewport: &Rectangle,
     ) {
-        let buffer = self.buffer.read().unwrap();
+        let buffer = self.buffer.lock().unwrap();
+
         let font_size = buffer.font_size();
         let line_height = buffer.line_height();
 
@@ -88,19 +89,16 @@ where
         );
 
         let line_x = layout.bounds().x as i32;
-        let mut line_y = layout.bounds().y as i32 + line_height;
+        let mut line_y = layout.bounds().y as i32 + font_size;
         let mut start_line_opt = None;
         let mut end_line = FontLineIndex::new(0);
         for (line_i, line) in buffer
             .layout_lines()
             .iter()
             .skip(buffer.scroll as usize)
+            .take(buffer.lines() as usize)
             .enumerate()
         {
-            if line_y >= (layout.bounds().y + layout.bounds().height) as i32 {
-                break;
-            }
-
             end_line = line.line_i;
             if start_line_opt == None {
                 start_line_opt = Some(end_line);
@@ -213,7 +211,7 @@ where
         _clipboard: &mut dyn Clipboard,
         _shell: &mut Shell<'_, Message>,
     ) -> Status {
-        let mut buffer = self.buffer.write().unwrap();
+        let mut buffer = self.buffer.lock().unwrap();
 
         match event {
             Event::Keyboard(key_event) => match key_event {
diff --git a/examples/editor-orbclient/src/main.rs b/examples/editor-orbclient/src/main.rs
index e4785a3..6cdf913 100644
--- a/examples/editor-orbclient/src/main.rs
+++ b/examples/editor-orbclient/src/main.rs
@@ -97,11 +97,12 @@ fn main() {
     let mut mouse_left = false;
     let mut rehit = false;
     loop {
+        //TODO: do not use this
+        buffer.shape_until_scroll();
+
         let font_size = buffer.font_size();
         let line_height = buffer.line_height();
 
-        buffer.shape_until_scroll();
-
         if rehit {
             let instant = Instant::now();