Testing Whplus.com IIX vps provider

A few days ago, I’m buying another vps from Indonesian Provider / IIX, Whplus.com
My last experience with them is nice, so I try to rejoin them again. Bought the OpenVZ with 256MB memory, and installing the wordpress with the vps configured with Minstall 2.5.7.
But after completing the wordpress installation and I want to change the template or any process to the wordpress, I always getting this screen. No error can be  found in the log, so I just assume it’s a problem at the vps side.
CPU Info

# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 44
model name      : Intel(R) Xeon(R) CPU           E5606  @ 2.13GHz
stepping        : 2
cpu MHz         : 2133.495
cache size      : 8192 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt aes lahf_lm arat epb dts tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4266.99
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

Memory Info

:~# cat /proc/meminfo
MemTotal:         262144 kB
MemFree:          100516 kB
Cached:           122536 kB
Active:            71272 kB
Inactive:          81748 kB
Active(anon):      26512 kB
Inactive(anon):     3972 kB
Active(file):      44760 kB
Inactive(file):    77776 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:         30484 kB
Shmem:             58412 kB
Slab:               8592 kB
SReclaimable:       6296 kB
SUnreclaim:         2296 kB

Akhirnya saya cancel lagi vps saya di WHplus 🙁

• Koneksi ssh terkadang disconnect sendiri
• Koneksi ssh dari luar negeri terlalu lambat
• Login ke SolusVM ternyata tidak ada perbaikan dari tahun kemarin, masih lama, dan ssl error
• Tidak mampu untuk menjalankan sebuah blog sederhana tanpa pengunjung, selalu error seperti diatas. Sudah dicoba merubah /etc/hosts dan menambahkan value api.wordpress.org tapi masih muncul error
• Belum ada IPv6