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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - Fill down cells with VLOOKUP formula is slow"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=136796">136796</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Fill down cells with VLOOKUP formula is slow
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>LibreOffice
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>6.4.6.2 release
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Calc
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>libreoffice-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>suokunlong@126.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=165556" name="attach_165556" title="test ods file">attachment 165556</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=165556&action=edit" title="test ods file">[details]</a></span>
test ods file

It is very slow to fill down a column with VLOOKUP formula.

Steps to Reproduce:
1. Type in "=VLOOKUP(A2,$aufnr.A:B,2,0)" in cell B2 of tab Sheet3.
2. Fill down the formula by double-clicking the + handle at the bottom-right
corner of cell B2.

Current Behaviour:
It takes a lot of time (>40s) on my pc before this column is successfully
filled.

Expected:
The column is filled with vlookup formula within 3 seconds. 
Even the old Microsoft Excel 2010 can do this within 3s.

Version: 6.4.6.2
Build ID: 0ce51a4fd21bff07a5c061082cc82c5ed232f115
CPU threads: 4; OS: Linux 5.8; UI render: default; VCL: gtk3; 
Locale: zh-CN (zh_CN.UTF-8); UI-Language: en-US
Calc: threaded</pre>
        </div>
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