After converting mp3s to AAC, does itunes write id3 tags?

I'm on OSX 10.3.9 and running iTunes 5.0.1. I just recently converted a lot of music which was on mp3 format to AAC at 128kbps (saved about 30% space with no loss of quality).
Now when I'm running iTunes, it lags and a small window comes up sporadically saying "Writing ID3 Tags."
Is this for the files I converted to AAC recently, or what's this all about?

out of interest how did you do the conversion ?
Make an intelligent playlist, with the setings, "kind is" - "MPEG"
Check that your "convert to" setting is AAC.
In your MPEG playlist, press command and a keys together (or Edit > Select All, from the menu bar) and choose Advanced > Convert to AAC.
When you are done, use Select All then option and delete keys together in the playlist, to remove the MPEGs from your library.

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                            <key>currentDocwListID</key>
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                            <key>docwEditorTabIndex</key>
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                            <key>docwListTabIndex_events</key>
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                            <key>docwListTabIndex_notes</key>
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                            <key>listsAreVisible</key>
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                                    <integer>21</integer>
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                                    <integer>13</integer>
                                    <integer>14</integer>
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