My code is hittting governor limits incase of multiple records update or insert.

Please help me to reduce number of script statements in this code,

Sometimes eventhoug we are not updating anything regarding to account, this trigger is calling,

we have rollup summary fields for this filed from another object is that the reason?

rigger Behr_InsertAccountTeamMember_US on Account (after insert,after update) {
 List<AccountTeamMember> lstAcTeam = new List<AccountTeamMember>();

List<UserRole> lstrole=new List<Userrole>();
map<ID,set<ID>> usermap=new map<ID,set<ID>>();
map<Id,Id> maprole=new map<Id,Id>();
map<Id,Id> accmap=new map<Id,Id>();
map<Id,Id> mapownerrole=new map<Id,Id>();
List<User> ownerrolelst=new List<User>();
set<ID> setOwner=new set<Id>();
List<User> userList=new List<User>();
lstrole=[select id,ParentRoleId from UserRole];
set<ID> Parentlst=new set<ID>();
map<Id,Id> userproId=new Map<Id,Id>();
set<Id> TeamMember=new Set<Id>();
List<AccountShare> lstAccShare =new List<AccountShare>();
List<AccountShare> lstUpdateAccShare = new List<AccountShare>();

set<Id> accid=new set<Id>();

for(UserRole ur:lstrole){
maprole.put(ur.id,ur.ParentRoleId);

}
Profile p=[select Id from Profile where name='Standard User Level 2'];
//Profile p=[select Id from Profile where name='System Administrator'];

userList=[select id ,Userroleid,ProfileId from user where IsActive=true ];
for(User u1:userList){
userproId.put(u1.id,u1.ProfileId);
if(usermap.get(u1.userroleid)!=null){

usermap.get(u1.userroleId).add(u1.id);

}
else{
set<Id> setuid=new set<ID>();
setuid.add(u1.id);
usermap.put(u1.userroleid,setuid);

}
}

for(Account acc:trigger.new){
    accmap.put(acc.id,acc.ownerid);
    setOwner.add(acc.OwnerId);
    accid.add(acc.id);
}

ownerrolelst=[select id ,userroleid from user where id in:setOwner ];
Userrole adminrole1=[select id from Userrole where Name='System Administrator'];
system.debug('OOOO'+adminrole1.id);
Userrole chinarole=[select id from Userrole where Name='China Users'];
Userrole ITDEVrole=[select id from Userrole where Name='IT DEV'];
Userrole ProMktgadmin=[select id from Userrole where Name='Pro Mktg Administrator'];
Userrole ProMktguser=[select id from Userrole where Name='Pro Marketing User'];
 Userrole ProSalesSVP=[select id from Userrole where Name='Pro Sales SVP'];
for(User u:ownerrolelst){
mapownerrole.put(u.id,u.UserRoleId);

}
for(Id acccid:accmap.keyset()){
if((Trigger.isInsert ||(Trigger.isupdate && Trigger.newmap.get(acccid).Ownerid!=Trigger.oldmap.get(acccid).OwnerId))&& userproId.get(accmap.get(acccid))==p.id){
//Parentlst.add(mapownerrole.get(accmap.get(acccid)));
id role=mapownerrole.get(accmap.get(acccid));
Id ParentRoleNext=maprole.get(mapownerrole.get(accmap.get(acccid)));
system.debug('PPPPPPPPPPPPPPPP'+role);

if( role!=adminrole1.id && role!=chinarole.id && role!=ITDEVrole.id && role!=ProMktgadmin.id && role!=ProMktguser.id){

while(ParentRoleNext!=ProSalesSVP.id    ){
system.debug('within if block');
if(maprole.containskey(ParentRoleNext))
system.debug('PPPPPPPPPPPPPPPP'+role);
Parentlst.add(ParentRoleNext);
system.debug('IIIIIIII'+Parentlst);
ParentRoleNext=maprole.get(ParentRoleNext);
}
system.debug('@@@@@@'+Parentlst);
for(Id pid: Parentlst){
for(id uid1:usermap.get(pid)){
AccountTeamMember tm = new AccountTeamMember();
                tm.UserId =uid1;
                tm.AccountId = acccid;
                tm.TeamMemberRole = 'Sales Manager';

lstAcTeam.add(tm);
TeamMember.add(uid1);
}

}

}
AccountTeamMember tm1 = new AccountTeamMember();
                tm1.UserId =accmap.get(acccid);
                tm1.AccountId = acccid;
                tm1.TeamMemberRole = 'Sales Rep';
                lstAcTeam.add(tm1);
  // TeamMember.add(accmap.get(acccid));             
}
}
if(lstAcTeam.size()>0){
insert lstAcTeam;


 lstAccShare = [Select Id, AccountId, OpportunityAccessLevel, AccountAccessLevel,ContactAccessLevel, UserOrGroupId ,
                        CaseAccessLevel From AccountShare where AccountId IN: accid
                          AND UserOrGroupId IN: TeamMember] ;


         }       

 for (AccountShare ash:lstAccShare )
            {
            ash.AccountAccessLevel='Edit';
            ash.ContactAccessLevel='Edit';
            ash.OpportunityAccessLevel='Edit';
            ash.CaseAccessLevel ='Edit';
            
            lstUpdateAccShare.add(ash);
            } 
         update lstUpdateAccShare;

                        

}