'vector smash protection is enabled'... makes flash slow on Win7

I;m trying to troubleshoot why the performance of flash player is slow and found that flash player raises inner exception with message 'vector smash protection is enabled.'

# ChildEBP RetAddr
Args to
Child            

00 18f879a0 75150611 40010006 00000000 00000002 kernelbase!RaiseException

01 18f87c0c 5f20dbfc 18f87c34 5fbd7c20 5f1a626d kernelbase!OutputDebugStringA+0x286

02 18f880f4 5ead91e6 18f881b0 5fb10780 00000000 flash32_21_0_0_213!IAEModule_IAEKernel_UnloadModule+0x1ebe2c

03 18f88118 77035c63 770a8340 7702a0a4 6ff102e0 flash32_21_0_0_213+0x591e6

04 18f88120 7702a0a4 6ff102e0 00000000 18f88150 ntdll!LdrDisableThreadCalloutsForDll+0x84

05 18f88158 00000000 5fbd7c20 18f881f8 5ec8f2a3 ntdll!LdrDisableThreadCalloutsForDll+0x6d

0:008> dc 18f87c34

18f87c34  74636556 7320726f 6873616d 6f727020  Vector smash pro

18f87c44  74636574 206e6f69 65207369 6c62616e  tection is enabl

18f87c54  0a2e6465 00251a00 18f87e5c 00000030  ed....%.\~..0...

18f87c64  00000030 00000000 00000004 74762fc1  0............/vt

18f87c74  00000000 00000000 00000000 00000000  ................

18f87c84  00000000 00000000 00000000 00000000  ................

18f87c94  00000000 00000000 00000000 00000000  ................

18f87ca4  00000000 00000000 00000000 00000000  ................

I think because of this inner exception, the performance of the flash is getting slow.

Roughly it takes over 5 seconds until playing the video on every web pages containing flash object.

I'd like to know following several things.

1. Why this message occurs whenever loading flash on web page?

2. How to avoid this issue?

3. Can I disable the unknown feature - 'Vection smash protection' ?

- I've also installed the latest version but the result were same.

- The environment of the reproduction machines are Windows 7(64+32bit) + IE11.

I'm looking forward to hearing from you promptly.

Thanks in advance.