GROWTH of container traffic in Southeast Asia is forecast to average 11 per cent annually between 1990 and 1995 while the traffic of the rest of the world will rise by 4.9 per cent per annum, says a consultant. Quoting estimates from Drewry Shipping Consultants, Chan Tuck Hoi, director of Regional Container Line (RCL), said the forecast for the first part of 1990s however was lower than 1980s. ''Economic growth rate, although expected to remain high, will move at a slower pace,'' he said in his paper entitled ''Asia as the new dynamo for liner shipping'' presented at the ICIE conference. The rapid and high rate of growth in container flows in this region was due to fast economic growth and building of infrastructure, rapid expansion of manufacturing sectors with strong orientation towards exports and gradual conversion of breakbulk conventional cargo to containers, he added. Mr Chan said the present feeder network that evolved over the past 10 years started modestly with Thailand and expanded rapidly to Malaysia, Indonesia and other parts of Southeast Asia. ''There are now 15 or more feeder routes hubbing at Singapore served by at least 30 short-haul liner operators,'' he said. The size of feeders ranges from 150 TEUs to 1,200 TEUs, he added. Frequencies of services were at least weekly if not daily, such as RCL's Bangkok-Singapore shuttle service, to cater not only for transshipment containers but also intra-Asian container traffic, Mr Chan said.