PCA in GEE, layer error mesage-Computation time out

Question

I am trying to get the PCA using following codes for sentinel 2A in GEE, but I get the message-computation time out. Is there a way to solve the issue?

function maskS2clouds(image) {
  var qa = image.select('QA60');

  // Bits 10 and 11 are clouds and cirrus, respectively.
  var cloudBitMask = 1 << 10;
  var cirrusBitMask = 1 << 11;

  // Both flags should be set to zero, indicating clear conditions.
  var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
      .and(qa.bitwiseAnd(cirrusBitMask).eq(0));

  return image.updateMask(mask).divide(10000);
}

var dataset = ee.ImageCollection('COPERNICUS/S2_SR_HARMONIZED')
                  .filterDate('2022-1-01', '2023-01-30')
                  .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE',5)) 
                  .map(maskS2clouds);

var s2a=dataset.median().clip(nepal);

var bands=['B2','B3','B4','B5','B8','B11'];

var arrayImage = s2a.select(bands).toArray();

var covar = arrayImage.reduceRegion({
  reducer: ee.Reducer.covariance(),
  geometry:nepal,
  maxPixels: 1e10,
  scale:10,
  bestEffort: true

  });

var covarArray = ee.Array(covar.get('array'));

var eigens = covarArray.eigen();

var eigenVectors = eigens.slice(1, 1);

var principalComponents = ee.Image(eigenVectors)
.matrixMultiply(arrayImage.toArray(1));


var pcImage = principalComponents
    .arrayProject([0])
   .arrayFlatten([['pc1', 'pc2', 'pc3', 'pc4', 'pc5', 'pc6']]);

var pc1=pcImage.select('pc1');
print(pc1);

Answer 1

This is a scale issue. So, by using an arbitrary area in Nepal (you don't provide one) as your roi and modifying following variable as follows:

var covar = arrayImage.reduceRegion({
  reducer: ee.Reducer.covariance(),
  geometry:nepal,
  maxPixels: 1e10,
  scale:100,
  bestEffort: true

  });

your code woks without any problem; as it can be observed in following picture: