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Subject5.2-rc2: low framerate in flightgear, cpu not running at full speed, thermal related?

When I start flightgear, I get framerates around 20 fps and cpu at

pavel@duo:~/bt$ cat /proc/cpuinfo | grep MHz
cpu MHz : 3027.471
cpu MHz : 2981.863
cpu MHz : 2958.352
cpu MHz : 2864.001

(Ok, fgfs is really only running at single core, so why do both cores
run at 3GHz?)

But temperatures get quite high:

pavel@duo:~/bt$ sensors
Adapter: ISA adapter
fan1: 4485 RPM

Adapter: ISA adapter
Package id 0: +98.0°C (high = +86.0°C, crit = +100.0°C)
Core 0: +98.0°C (high = +86.0°C, crit = +100.0°C)
Core 1: +91.0°C (high = +86.0°C, crit = +100.0°C)

And soon cpu goes to 1.5GHz range, with framerates going down to
12fps. That's a bit low.

Room temperature is 26Celsius.

The CPU is Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz . I guess it means
it should be able to sustain both cores running at 2.5GHz?

Any ideas? Were there any recent changes in that area?

Best regards,

(cesky, pictures)
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