The security staffing is seemingly the same every day. So generally it’s been ok on on weekdays outside school holidays. However on weekends (and during the whole of the February half term) the queues and delays have been big.
Also, come the last week of this month, the summer schedules start for many of the airlines. The number of operated flights takes a sudden upturn. Not entirely sure how Terminal 1 will cope as it’s already been at full capacity during peak times (with regards to seating, security, queues out the door at all food premises etc).