Vmap - Question

[fnm]

i have vmaps and...

if i have

GridUnload = 0
SocketSelectTime = 10000
GridCleanUpDelay = 300000
MapUpdateInterval = 100
ChangeWeatherInterval = 600000
PlayerSaveInterval = 30000
vmap.enableLOS = 1
vmap.enableHeight = 1
vmap.ignoreMapIds = "369"
vmap.ignoreSpellIds = "7720"
DetectPosCollision = 1
TargetPosRecalculateRange = 1.5
UpdateUptimeInterval = 10
MaxCoreStuckTime = 10

PID USER

12651 mangos CPU: 80% MEM 60.2%

28097 mysql CPU: 1% MEM: 1.2%

but if i use this conf

GridUnload = 1
SocketSelectTime = 10000
GridCleanUpDelay = 300000
MapUpdateInterval = 100
ChangeWeatherInterval = 600000
PlayerSaveInterval = 30000
vmap.enableLOS = 1
vmap.enableHeight = 1
vmap.ignoreMapIds = "369"
vmap.ignoreSpellIds = "7720"
DetectPosCollision = 1
TargetPosRecalculateRange = 1.5
UpdateUptimeInterval = 10
MaxCoreStuckTime = 10

i have jumps from 30%/90% used cpu and lags in game (50/60 ppl online)

core2duo 2.4 GHZ, 4GB DDR2, Debian etch 32bit

i have this problem only on vmaps... maby i have wrong conf ? or bad vmaps?

somebody can help me whats wrong?

/sry 4 my eng