CPU load 27%, when Acrobat Reader is idle

[sibare]

Wine-Version: Staging 5.18
Acrobat Reader 5.0 from
https://www.chip.de/downloads/Acrobat-R ... 99773.html
in a 32 bit prefix.

When I open for example MS Word 2010 in a wine 32 bit prefix this takes 0% CPU, when idle.
But just wondering, why Acrobat Reader 5.0 needs 27% ?
Is this normal?

Thank you.