From df04e7d44afa4407c209d5a3007ca53cb9d15300 Mon Sep 17 00:00:00 2001
From: daa <andrey.dubravin@gmail.com>
Date: Sat, 5 May 2018 23:08:40 +0300
Subject: [PATCH] Speed optimization

---
 src/ui_model/line.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/ui_model/line.rs b/src/ui_model/line.rs
index 5061df9..9b026ab 100644
--- a/src/ui_model/line.rs
+++ b/src/ui_model/line.rs
@@ -243,8 +243,11 @@ pub struct StyledLine {
 
 impl StyledLine {
     pub fn from(line: &Line, color_model: &color::ColorModel) -> Self {
-        let mut line_str = String::new();
-        let mut cell_to_byte = Vec::new();
+
+        let average_capacity = line.line.len() * 4 * 2; // code bytes * grapheme cluster
+
+        let mut line_str = String::with_capacity(average_capacity);
+        let mut cell_to_byte = Vec::with_capacity(average_capacity);
         let attr_list = pango::AttrList::new();
         let mut byte_offset = 0;
         let mut style_attr = StyleAttr::new();