How is possible check and increase the maximum percentage of available memory to use for loading rasters?
The Limit usage allows you to set the maximum percentage of available memory. By default is 25%. You can increase this amount.
The field below displays the percentage in the equivalent number of MBs
https://communities.bentley.com/products/microstation/w/microstation__wiki/14933.how-can-i-improve-memory-allocation-on-my-pc-for-raster-manager