The environment minister, Sussan Ley, has flagged the government may change Australia’s national environment laws before a review is finished later this year.

Ley said she would introduce “early pieces of legislation” to parliament if she could to “really get moving with reforming and revitalising one of our signature pieces of environmental legislation”.

It follows business groups and the government emphasising the need to cut red tape as part of the economic recovery from the coronavirus crisis, and comes as the businessman Graeme Samuel chairs an independent statutory review of the Environment Protection and Biodiversity Conservation (EPBC) Act. An interim report is due in June, followed by a final report in October.

When the review was announced, the government said it would be used to “tackle green tape” and speed up project approvals.

Environmental organisations have stressed the need for tougher environmental protections to stem Australia’s high rate of extinction. Australia has lost more than 50 animal and 60 plant species in the past 200 years and recorded the highest rate of mammalian extinction in the world over that period.

Ley said, with the interim report due by the middle of the year, she expected Samuel would “in the course of the review, identify a range of measures that we can take to prevent unnecessary delays and improve environmental standards”.

“Where there are opportunities to make sensible changes ahead of the final EPBC review report, I will be prepared to do so,” she said.

On Thursday, Ley and the prime minister, Scott Morrison, said work was already under way to speed up environmental assessments of projects and that the number of on time “key decisions” in the EPBC process had improved from 19% in the December quarter to 87% in the March quarter.

An environment department spokesman said key decisions covered three items in the assessment process: the decision on whether a project requires assessment under the act, the decision on what assessment method will be used, and the final decision on whether or not to approve the project.

“For the December quarter 2019, the Department met 19% of the 80 key decisions due that quarter. This increased to meeting the statutory timeframes for 87% of the 61 key decisions due in the March quarter 2020,” he said.

The environment department also publishes annual data on the percentage of EPBC-related decisions that are made on time. This data covers several types of decisions in the assessment process, not just the final approval of a project.

In the 2018-19 financial year, 60% of decisions were made on time.

But it is not just project assessments that are subject to delays. Species assessments and recovery planning timeframes have also become longer in recent years.

Brendan Sydes, the chief executive of Environmental Justice Australia, said there was nothing preventing the government from making changes to the act before the review was complete. But he said it would be “a bit strange to act on draft recommendations rather than the final report”.

“Clearly the draft will be the first opportunity people have to scrutinise or see what the Samuel review is likely to recommend,” Sydes said.

He said the review was about more than just streamlining the act and there were other important priorities, including improving protections for threatened species.

“It really ought to be treated as a comprehensive package of reform if there are to be reforms after the review,” he said.

“No one opposes the act being as efficient and effective as possible but we really need to have a focus on the objectives the act is attempting to achieve, rather than streamlining and processes.”

David Morris, the chief executive of the Environmental Defenders Office, said there could be instances where it was sensible to propose legislative changes before the review was complete, but it would depend on what was being proposed.

“We’re supportive of sensible changes to legislation,” he said.

But he added the government “would want to avoid any perception that they were making poor environmental decisions and then fast-tracking those at a time when people are distracted by a major pandemic”.

Amelia Young, the national campaigns director for The Wilderness Society, warned against the idea that cutting environmental protections could act as an economic stimulus measure once Covid-19 restrictions are eased.

“Weaker environmental protections and fast-tracked infrastructure approvals are not part of a safe and positive future for Australia as we recover from the coronavirus challenge,” she said.

Young said many Coalition MPs had shown concern over the suffering and loss of wildlife during the bushfire season and were aware of heightened environmental concern in the community.

“Many government MPs met with our local membership groups and discussed the issue at length. These MPs well know that there is huge community support towards better protecting Australia’s natural environment,” she said.