Try this:
PHP Code:
#include <amxmodx>
#include <hamsandwich>
#include <fun>
new const Float:g_fMultiplier = 1.3; // 30 % increase
public plugin_init( )
{
register_plugin( "Speed per cent", "1.0", "Jon" );
RegisterHam( Ham_Item_PreFrame, "player", "FwdPreFramePost", 1 );
}
public FwdPreFramePost( iClient )
{
set_user_maxspeed( iClient, get_user_maxspeed( iClient ) * g_fMultiplier );
}
Edit: Hi Sylwester