diff --git a/lua/cmp/core.lua b/lua/cmp/core.lua
index 423420d..89aadd2 100644
--- a/lua/cmp/core.lua
+++ b/lua/cmp/core.lua
@@ -58,6 +58,7 @@ end
 core.get_context = function(self, option)
   local prev = self.context:clone()
   prev.prev_context = nil
+  prev.cache = nil
   local ctx = context.new(prev, option)
   self:set_context(ctx)
   return self.context
diff --git a/lua/cmp/entry.lua b/lua/cmp/entry.lua
index 6fa5460..34cdf2c 100644
--- a/lua/cmp/entry.lua
+++ b/lua/cmp/entry.lua
@@ -60,13 +60,15 @@ entry.get_offset = function(self)
       local range = misc.safe(self:get_completion_item().textEdit.insert) or
           misc.safe(self:get_completion_item().textEdit.range)
       if range then
-        local c = misc.to_vimindex(self.context.cursor_line, range.start.character)
-        for idx = c, self.source_offset do
-          if not char.is_white(string.byte(self.context.cursor_line, idx)) then
-            offset = idx
-            break
+        offset = self.context.cache:ensure({ 'entry', 'get_offset', range.start.character }, function()
+          local c = misc.to_vimindex(self.context.cursor_line, range.start.character)
+          for idx = c, self.source_offset do
+            if not char.is_white(string.byte(self.context.cursor_line, idx)) then
+              return idx
+            end
           end
-        end
+          return offset
+        end)
       end
     else
       -- NOTE
@@ -213,7 +215,8 @@ entry.get_view = function(self, suggest_offset, entries_buf)
       view.kind.text = item.kind or ''
       view.kind.bytes = #view.kind.text
       view.kind.width = vim.fn.strdisplaywidth(view.kind.text)
-      view.kind.hl_group = item.kind_hl_group or ('CmpItemKind' .. (types.lsp.CompletionItemKind[self:get_kind()] or '')
+      view.kind.hl_group = item.kind_hl_group or
+          ('CmpItemKind' .. (types.lsp.CompletionItemKind[self:get_kind()] or '')
           )
       view.menu = {}
       view.menu.text = item.menu or ''
diff --git a/lua/cmp/source.lua b/lua/cmp/source.lua
index 9a364ec..f3d2047 100644
--- a/lua/cmp/source.lua
+++ b/lua/cmp/source.lua
@@ -105,13 +105,14 @@ source.get_entries = function(self, ctx)
 
   local inputs = {}
   local entries = {}
+  local matching_config = self:get_matching_config()
   for _, e in ipairs(target_entries) do
     local o = e:get_offset()
     if not inputs[o] then
       inputs[o] = string.sub(ctx.cursor_before_line, o)
     end
 
-    local match = e:match(inputs[o], self:get_matching_config())
+    local match = e:match(inputs[o], matching_config)
     e.score = match.score
     e.exact = false
     if e.score >= 1 then
diff --git a/lua/cmp/utils/window.lua b/lua/cmp/utils/window.lua
index b150c03..837dc6d 100644
--- a/lua/cmp/utils/window.lua
+++ b/lua/cmp/utils/window.lua
@@ -1,4 +1,3 @@
-local cache = require('cmp.utils.cache')
 local misc = require('cmp.utils.misc')
 local buffer = require('cmp.utils.buffer')
 local api = require('cmp.utils.api')
@@ -20,7 +19,6 @@ local api = require('cmp.utils.api')
 ---@field public style cmp.WindowStyle
 ---@field public opt table<string, any>
 ---@field public buffer_opt table<string, any>
----@field public cache cmp.Cache
 local window = {}
 
 ---new
@@ -32,7 +30,6 @@ window.new = function()
   self.sbar_win = nil
   self.thumb_win = nil
   self.style = {}
-  self.cache = cache.new()
   self.opt = {}
   self.buffer_opt = {}
   return self