How to do a code optimization for data export/import to uielements

I have a gui with a uitable with a maximum of 30 rows and 30 edit-boxes. I what 2 specific things. 1) Export the cell array with the uitable strings (4 columns and 1–30 rows). Then I want the values of the 30 edit-boxes inserted in the cell array in column 5. 2) Finally I want to be able to load the exported cell array; the 4 first columns into the uitable and the 5th column into the edit-boxes. The code I have created (see below) is exporting/importing an excel sheet but it is very slow, even with only 5–7 rows in the uitable. How can I make this faster and more elegant. I doesn’t have to be an excel sheet. It can be a *.txt, *.cvs or something else (not *.mat).

% --- Dataset example
GUIstate = {
    'REF20171002-2.txt'    'REF20171002-2'    '217096907-1.txt'    [217096907]    [1]
    'REF20171002-4.txt'    'REF20171002-4'    '217096909-1.txt'    [217096909]    [3]
    'REF20171002-4.txt'    'REF20171002-4'    '217096911-1.txt'    [217096911]    '' 
    'REF20171002-4.txt'    'REF20171002-4'    '217100125-1.txt'    [217100125]    [5]
    'REF20171002-4.txt'    'REF20171002-4'    '217100141-1.txt'    [217100141]    '' 
}

% --- Save GUI state on pushbutton324.
function pushbutton324_Callback(hObject, eventdata, handles)
Folder=handles.Folder;
data = get( handles.uitable1, 'data');
data2 = data(:,[1:4]);
data3 = data2(~all(cellfun('isempty', data2(:, 3)), 2), :);
[r c]=size(data3);
num=r;
adj=cell(num,1);
  for i = 1:num
        adj{i,1}=get(handles.(sprintf('edit%d',i)),'String');    
  end  
data3(:,5)=adj;

[filename, pathname] = uiputfile(fullfile(Folder, '*.xls'),'Save GUI file as');
newfilename = fullfile(pathname, filename);
xlswrite(newfilename,data3);

% --- Load GUI state on pushbutton325.
function pushbutton325_Callback(hObject, eventdata, handles)
Folder=handles.Folder;
[filename, pathname] = uigetfile(fullfile(Folder, '*.xls'));
newfilename = fullfile(pathname, filename);
[~, ~, data] = xlsread(newfilename,'Sheet1');
set( handles.uitable1, 'Data', data(:,1:4)); 
conc=data(:,5); 
[r c]=size(data);
num=r;
  for k = 1:num;
    if isnan(conc{k})
      conc{k} = '';
    end
  end 
for i = 1:num
    set(handles.(sprintf('edit%d',i)),'String',conc{i,1});
end