When mob trace player will LAG?

[bluesky]

same as 

I found some player maliciously aggregated the monsters, it let my server all player lag.

When about 150 monster trace a player

Server will be very lag,   all map player feel  lag ,  not only that map.

But only trace will be lag,  if monster around the player and attack , it will not lag.

 

I try to modify conf\battle\monster.conf

Quote

// How often should a monster rethink its chase?
// 0: Every 100ms (MIN_MOBTHINKTIME)
// 1: Every cell moved
// 2: Every 2 cells moved
// 3: Every 3 cells moved (official)
// x: Every x cells moved
// Regardless of this setting, a monster will always rethink its chase if it has 
// reached its target. Increase this value if you want to make monsters continue
// moving after they lost their target (hide, no line of sight, etc.).
monster_chase_refresh: 6

 

Quote

// Mobs and Pets view-range adjustment (range2 column in the mob_db) (Note 2)
view_range_rate: 50

but still lag 
 

My test computer CPU / ram / rathena version

computer-1  : Intel(R) Core(TM)i7-8700  3.20GHz  3.19GHz      ram 16G   64bit

computer-2  : intel(R) Xeon(R) CPU X5650 2.67GHz 2.67GHz   ram 32G   64bit

Rathena 2019-03-28 
Hash version 339e6c6

Client version:20180620
 

And I try to use my old Rathena about 2018-03  with same computer

Didn't have this problem, I aggregated about 1000 monsters ,  it would not lag 

Only new Rathnea have this problem

I also try to download the newest Rathena 2019-05-17   hash version 40cc613

no any modify , no any custom script, but still happened
 

How can I do to fix this problem?

Thank you!!!

Edited May 19, 2019 by bluesky