[Tile-serving] [osm2pgsql] .o5m really slow compared to .osm.pbf (#473)

[Lucas Leblow]

Version ```0.89.0-dev (64bit id space)```

CPU info:
```
$ lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                24
On-line CPU(s) list:   0-23
Thread(s) per core:    2
Core(s) per socket:    6
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 45
Model name:            Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
Stepping:              7
CPU MHz:               2148.203
CPU max MHz:           2500.0000
CPU min MHz:           1200.0000
BogoMIPS:              3991.36
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              15360K
NUMA node0 CPU(s):     0-5,12-17
NUMA node1 CPU(s):     6-11,18-23
```

I was unsure if extra cache made a difference as I saw quite a few other examples around the web with larger cache sizes

---
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https://github.com/openstreetmap/osm2pgsql/issues/473#issuecomment-151315875
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