Remove empty rows in Google Sheets

I have the following problem with this function. It only deletes blank rows below but I want to delete the rows above.

function removeEmptyRows(){
  var sh = SpreadsheetApp.getActive();
  var sh1=sh.getSheetByName('name');
  var range=sh1.getRange('A:A');
  var maxRows = sh1.getMaxRows(); 
  var lastRow = sh1.getLastRow();
  sh1.deleteRows(lastRow+1, maxRows-lastRow);
}

I tried with the following function

function removeemptyrows(){
    var ss=SpreadsheetApp.getActive();
    var sh1=ss.getSheetByName('name');
    var range=sh1.getRange('A:A');
    var values = range.getValues();
    for( var i = values.length-1; i >=0; i-- ) {
      for( var j = 0; j < values[i].length; j++ )
        if( values[i][j] === "" )
          sh1.deleteRow(i+1)
          }
  }

but it deletes rows too slowly - one by one.

Solution

Here is my understanding:

You want to delete the rows that the cell of column "A" is empty in the range from 10 row to bottom of sheet.
You want to achieve this using Google Apps Script.
You want to reduce the process cost.

Modification point:

In this case, I would like to propose to use Sheets API. When Sheets API is used, the rows can be deleted by one API call, even when the rows are discreted.

Sample script:

When you use this script, please enable Sheets API at Advanced Google services.

function removeemptyrows() {
  var sheetName = "name"; // Please set the sheet name.

  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName(sheetName);
  var sheetId = sheet.getSheetId();
  var values = sheet.getRange('A10:A').getValues();
  var requests = values.reduce(function(ar, [e], i) {
    if (!e) ar.push({deleteDimension:{range:{sheetId:sheetId,dimension:"ROWS",startIndex:(i + 9),endIndex:(i + 10)}}});
    return ar;
  }, []).reverse();
  if (requests.length > 0) Sheets.Spreadsheets.batchUpdate({requests: requests}, ss.getId());
}

In this case, the sample script is almost the same with the below script of https://stackoverflow.com/a/60613983/7108653 . As 2 modification parts, in your case, you want to delete the rows of empty cell at the column "A". So 'C6:C' + sheet.getLastRow() and if (e) were modified to 'A10:A' and if (!e), respectively.

Remove empty rows in Google Sheets

Modification point:

Sample script:

References: