Firefox and slow JavaScript in 64 bit

Hello!
I've installed 64 bit Archlinux on my laptop. I noticed poor JavaScript performance with firefox. I had 32 bit linux before. I ran benchmark from this site: http://www2.webkit.org/perf/sunspider-0 … pider.html and I got these results (approximately) - Less means better:
firefox 3.0.11 - 3200 ms
firefox 3.5rc2 - 1500 ms
midori 0.1.7 - 1400 ms
But now on 64 bit, firefox is slown down:
firefox 3.0.11 - 3800 ms
firefox 3.5rc3 - 3200 ms
midori 0.1.7 - 860 ms
I tried several builds including self compiling, but results are the same
Well, it's not that big issue, because browsing is fine. I'm just curious why there is such difference. I thought 64 bit would be even faster...

Same thing here.
Firefox is significantly slower Here "FROM" is firefox TEST COMPARISON ==================================== ** TOTAL **: 3.01x as fast ==================================== 3d: 2.28x as fast cube: 3.04x as fast morph: 1.73x as fast raytrace: 2.35x as fast access: 4.34x as fast binary-trees: 4.15x as fast fannkuch: 4.93x as fast nbody: 3.94x as fast nsieve: 3.88x as fast bitops: 6.19x as fast 3bit-bits-in-byte: 6.55x as fast bits-in-byte: 5.30x as fast bitwise-and: 9.86x as fast nsieve-bits: 5.00x as fast controlflow: 6.34x as fast recursive: 6.34x as fast crypto: 3.24x as fast aes: 2.45x as fast md5: 2.77x as fast sha1: 5.51x as fast date: 2.14x as fast format-tofte: 2.42x as fast format-xparb: 1.85x as fast math: 2.66x as fast cordic: 4.61x as fast partial-sums: 1.89x as fast spectral-norm: 2.79x as fast regexp: 5.46x as fast dna: 5.46x as fast string: 2.42x as fast base64: 2.78x as fast fasta: 1.90x as fast tagcloud: 2.32x as fast unpack-code: 2.99x as fast validate-input: 2.05x as fast than midori.
3.0.11, "TO" is midori 0.1.7. Both are from extra.
FROM TO DETAILS
=========================================
3470.6ms +/- 6.6% 1152.4ms +/- 10.0% significant
=========================================
389.6ms +/- 8.4% 171.0ms +/- 17.1% significant
138.8ms +/- 10.2% 45.6ms +/- 45.3% significant
121.8ms +/- 9.9% 70.4ms +/- 42.9% significant
129.0ms +/- 21.9% 55.0ms +/- 5.3% significant
474.8ms +/- 13.3% 109.4ms +/- 32.1% significant
56.4ms +/- 19.8% 13.6ms +/- 44.6% significant
208.2ms +/- 14.6% 42.2ms +/- 43.2% significant
137.2ms +/- 17.9% 34.8ms +/- 15.7% significant
73.0ms +/- 39.8% 18.8ms +/- 56.2% significant
412.4ms +/- 7.4% 66.6ms +/- 12.1% significant
64.2ms +/- 19.9% 9.8ms +/- 48.6% significant
120.8ms +/- 17.8% 22.8ms +/- 11.2% significant
116.4ms +/- 7.6% 11.8ms +/- 46.2% significant
111.0ms +/- 11.8% 22.2ms +/- 8.3% significant
67.2ms +/- 24.1% 10.6ms +/- 58.4% significant
67.2ms +/- 24.1% 10.6ms +/- 58.4% significant
232.0ms +/- 11.4% 71.6ms +/- 18.5% significant
82.4ms +/- 17.6% 33.6ms +/- 40.7% significant
60.4ms +/- 18.2% 21.8ms +/- 11.0% significant
89.2ms +/- 15.7% 16.2ms +/- 44.2% significant
353.4ms +/- 15.6% 165.0ms +/- 16.0% significant
204.6ms +/- 14.0% 84.4ms +/- 17.8% significant
148.8ms +/- 20.4% 80.6ms +/- 25.5% significant
319.8ms +/- 8.7% 120.2ms +/- 27.4% significant
122.6ms +/- 13.9% 26.6ms +/- 46.2% significant
134.8ms +/- 20.7% 71.2ms +/- 32.1% significant
62.4ms +/- 16.9% 22.4ms +/- 32.5% significant
288.4ms +/- 16.1% 52.8ms +/- 34.8% significant
288.4ms +/- 16.1% 52.8ms +/- 34.8% significant
933.0ms +/- 16.6% 385.2ms +/- 11.1% significant
124.6ms +/- 22.6% 44.8ms +/- 44.8% significant
171.8ms +/- 16.6% 90.2ms +/- 9.6% significant
189.4ms +/- 9.0% 81.6ms +/- 28.5% significant
323.8ms +/- 41.1% 108.4ms +/- 8.8% significant
123.4ms +/- 11.0% 60.2ms +/- 29.4% significant

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Hello alexen, don't be sorry, please '''mark YOUR reply as chosen solution''' to help others with same problem.
thank you

Firefox and slow JavaScript in 64 bit

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