How to speed up the xlswrite in for loop

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In my project, I have 166 different type of character set is there, Each character set have 280 images. For each character I got 140 feature extracted data. I am try to store this data in excel sheet. I am using this code. It works but it takes too much time like 150 hours to execute. How to speed up this code, My code is

     B=[267;    279;    278;    271;    258;    258;    263;    269;    240;    266;    271;    249;    272;    264;    277;    271;    265;    272;    279;    268;    269;    272;    262;    273;    274;    268;    274;    280;    277;    264;    272;    277;    268;    277;    270;    275;    269;    270;    259;    276;    270;    266;    274;    279;    278;    270;    266;    276;    270;    277;    270;    274;    269;    272;    271;    279;    278;    277;    276;    278;    268;    268;    270;    270;    268;    266;    273;    256;    268;    271;    270;    277;    256;    276;
259;    276;    262;    269;    272;    269;    268;    261;    260;    273;    274;    275;    264;    276;    269;    276;    268;    268;    261;    256;    270;    279;    265;    260;    269;    258;    257;    263;    258;    276;    267;    269;    266;    274;    277;    270;    269;    261;    257;    259;    273;    272;    275;    270;    263;    274;    278;    274;    266;    269;    269;    259;    268;    272;    260;    278;    265;    268;    262;    273;    274;    278;    272;    267;    267;    270;    252;    238;    265;    258;    266;    275;    269;    271;    277;    280;    273;    276;    264;    265;    275;    275;    275;    264;    271;    266;    271;    266;    258;    264;      264;    254];
    for i=1:166
    x =cell(1,B(i));
    f1=cell(1,B(i));
    f2=cell(1,B(i));
    cellRef_0 = sprintf('A1');
    xlswrite('telugu_41-50.xls',i,i,cellRef_0);
    for j=1:B(i)
        cellRef1 = sprintf('B%d:CH%d',j,j);
        cellRef2 = sprintf('CI%d:EK%d',j,j);
        x{j}  = imread(sprintf('E:/apps/project/TELUGU data/telugu sep/%d/ (%d).jpg',i,j))
        f1{j} = feature_extractor(x{j});
        f2{j} = feature_extractor_2d(x{j});
        xlswrite('telugu_41-50.xls',f1{j},i,cellRef1);
        xlswrite('telugu_41-50.xls',f2{j},i,cellRef2);
    end
end
    load handel
    sound(y,Fs)