Yeah, forgot these markers there I realized after getting the video 
capture. The time I ordered my bro to take video capture, I did not know 
about the issue. Then I made these urls and ask him to test once more but 
didn't get the capture. He said mapbox and ol was the fastest, cesium and 
leaflet were problematic. But the leaflet one was having different kind of 
issue than performance. Although I believe issue is different than the 
marker styles; I'll ask him to take another capture of totally empty map as 
soon as I can reach him. By the way there is no official documentation that 
I could find in ol3 api doc or such place which shows the optimal way to 
create markers. Ol3 tips&tricks documents could be helpful somewhere.

I defined style to layer instead of each feature and they are all the same, 
there are 800 markers on the map:

      var layerStyle = new ol.style.Style({
  image: new ol.style.Icon({
anchor: [0.5, 37],
anchorXUnits: 'fraction',
anchorYUnits: 'pixels',
src: './media/image/busstop.png'
  })
});
var layerSource = new ol.source.Vector({});
var layer = new ol.layer.Vector({
source: layerSource,
style: layerStyle
});

 From that code, I believe ol defines style for layer and caches the style 
for each marker. If the problem is anchor position, maybe it should 
re-create canvas with right positioning or is this the responsibility of 
client? 

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