Hi All,
I have written a apex class and vf page ,like

Apex Code:
public class dashboardcontrollerFor30Days
{
    public list<innerdashdata> data{get;set;}
    public list<task> tsklist;
    public list<AggregateResult> tsklist2;
    public list<AggregateResult> tsklist3;
    public map<id,integer> countmap;
    public map<id,integer> countmap2;
    public map<id,integer> countmap3;
    public map<id,integer> countmap4;
    public map<id,map<string,integer>> mapofdata = new  map<id,map<string,integer>>();
    public list<event> evntlist;
    public dashboardcontrollerFor30Days()
    {
        Set<String> names = new Set<String>{'%ABC%'};
        Set<String> names2 = new Set<String>{'Call','Added to Case from Contacts','CourtLink Lead','Data Entry Request','Dogsheet Lead','Email','Gift','Research Request'};        
        tsklist = new list<task>();
        evntlist = new list<event>();
        countmap = new map<id,integer>();
        countmap2 = new map<id,integer>();
        countmap3 = new map<id,integer>();
        countmap4 = new map<id,integer>();
       
        tsklist = [select ownerid,id,status from task where (not subject like '%mass%') and (not subject like '%DFW Survival Football Pool %') and (not owner.name like:names) and type =:names2 and (status ='1. Completed - PHONE CALL' OR status ='2. Completed - LEFT MESSAGE' OR status ='3. Completed - SENT EMAIL' )  and lastmodifieddate = LAST_N_DAYS:30];
     
     for(task tk : tsklist )
     {
         if(!mapofdata.keyset().contains(tk.ownerid))
         {
             mapofdata.put(tk.ownerid,new map<string,integer>());
         }
         if(!mapofdata.get(tk.ownerid).keyset().contains(tk.status))
         {
             mapofdata.get(tk.ownerid).put(tk.status,0);
         }
        integer count =  mapofdata.get(tk.ownerid).get(tk.status)+1;
        mapofdata.get(tk.ownerid).put(tk.status,count );
     }
      system.debug('********************'+mapofdata);
     
     
     
        
         data = new list<innerdashdata>();
         map<id,user> usermap = new map<id,user>([select id,name from user where isactive = true]);
      
        for(string str : mapofdata.keyset())
        {
             integer counttotal =  (mapofdata.get(str).get('1. Completed - PHONE CALL')!=null?mapofdata.get(str).get('1. Completed - PHONE CALL'):0) + (mapofdata.get(str).get('2. Completed - LEFT MESSAGE')!=null?mapofdata.get(str).get('2. Completed - LEFT MESSAGE'):0) + (mapofdata.get(str).get('3. Completed - SENT EMAIL')!=null?mapofdata.get(str).get('3. Completed - SENT EMAIL'):0);
             system.debug('**************************'+counttotal );
             data.add(new innerdashdata(mapofdata.get(str).get('1. Completed - PHONE CALL')!=null?mapofdata.get(str).get('1. Completed - PHONE CALL'):0,mapofdata.get(str).get('2. Completed - LEFT MESSAGE')!=null?mapofdata.get(str).get('2. Completed - LEFT MESSAGE'):0,mapofdata.get(str).get('3. Completed - SENT EMAIL')!=null?mapofdata.get(str).get('3. Completed - SENT EMAIL'):0,usermap.get(str).name+' '+ string.valueof(counttotal)));
        }
         system.debug('***************countmap'+data);
        
        
             
    }

    public class innerdashdata
    {
    public string name{get;set;}
    public decimal data1{get;set;}
    public decimal data2{get;set;}
    public decimal data3{get;set;}
    public string total{get;set;}
   
        public innerdashdata(decimal  data1,decimal data2,decimal data3,string name)
        {
            this.data1 = data1;
            this.data2 = data2;
            this.data3 = data3;
            this.name = name;
            
        }
    }

}


===== vf page 



<apex:page controller="dashboardcontrollerFor30Days" showHeader="false" sidebar="false" cache="false">

<div style="width:255px; height:460px;background-color:#E8E8FF;">
  <apex:chart data="{!data}" height="460" width="250">
    <apex:axis type="Numeric" position="bottom" title="Count" fields="data1,data2,data3" dashSize="2">
        <apex:chartLabel />
    </apex:axis>
    
    <apex:axis type="Category" position="left" fields="name" title="Assigned" >
        <apex:chartLabel />
    </apex:axis>
       
    <apex:barSeries orientation="horizontal" axis="left" stacked="true" 
        yField="name" xField="data1,data2,data3" title="Completed - PHONE CALL,Completed - LEFT MESSAGE,Completed - SENT EMAIL" />
  </apex:chart>
  <hr/>
    <table style="background-color:#E8E8FF;width:255px;">
        <tr>
            <td>
                <img src="{!$Resource.Blue}" style="margin-left:50px;"/>
            </td>
            <td>
                Completed - PHONE CALL 
            </td>
        </tr>
        <tr>
            <td>
                <img src="{!$Resource.Orange}" style="margin-left:50px;"/>
            </td>
            <td>
                Completed - LEFT MESSAGE 
            </td>
        </tr>
        <tr>
            <td>
                <img src="{!$Resource.Green}" style="margin-left:50px;"/>
            </td>
            <td>
                Completed - SENT EMAIL  
            </td>
        </tr>
    </table>           
</div>

</apex:page>



in this code i got an error 'Time Limit Exceed' and page take lots of time on loading. So Please help me , how can i remove this error.