Although the notion of ‘too many markers’ have been mentioned in several research, in practice, displaying hundreds of Points of Interests (POI) on a web map in two dimensions with an acceptable usability remains a real challenge nowadays. Web practitioners often make excessive use of clustering aggregation to overcome performance bottlenecks without effectively resolving issues of perceived performance. This paper tries to bring a broad awareness by identifying a sample of experience issues which describe a general reality of clustering, and provide a pragmatic survey of potential technologies optimisations. At the end, we discuss the usage of technologies and the lack of documented client-server workflows, along with the need to enlarge our vision of the various clutter reduction methods.