No subject

So total 93.2% time spent in GC? Can anyone give me some suggestions on how to
improve?

Thanks!

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Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total
 time   seconds   seconds    calls   s/call   s/call  name
 38.84    657.63   657.63
_D3gcx3Gcx8findPoolMFPvZPS3gcx4Pool
 24.43   1071.29   413.66                             _D3gcx3Gcx4markMFPvPvZv
  9.52   1232.48   161.19
_D3gcx3Gcx11fullcollectMFPvZk
  6.71   1346.01   113.53                             _D6gcbits6GCBits4testMFkZk
  5.87   1445.33    99.32                             _D3gcx4Pool10allocPagesMFkZk
  3.64   1507.03    61.70
_D9invariant12_d_invariantFC6ObjectZv
  3.21   1561.38    54.35                             _D6gcbits6GCBits3setMFkZv
  0.98   1578.03    16.65                             _D3gcx12sentinel_addFPvZPv
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